Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757538AbYAJL4e (ORCPT ); Thu, 10 Jan 2008 06:56:34 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753681AbYAJL40 (ORCPT ); Thu, 10 Jan 2008 06:56:26 -0500 Received: from e31.co.us.ibm.com ([32.97.110.149]:42356 "EHLO e31.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752810AbYAJL4X (ORCPT ); Thu, 10 Jan 2008 06:56:23 -0500 Date: Thu, 10 Jan 2008 17:26:31 +0530 From: Ananth N Mavinakayanahalli To: lkml Cc: akpm@linux-foundation.org, mingo@elte.hu, ak@suse.de, sam@ravnborg.org, arjan@linux.intel.com Subject: [PATCH 2/7] Move locking-selftest to tests/ Message-ID: <20080110115631.GC26577@in.ibm.com> Reply-To: ananth@in.ibm.com References: <20080110115428.GA26577@in.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20080110115428.GA26577@in.ibm.com> User-Agent: Mutt/1.5.11 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 75816 Lines: 2914 From: Ananth N Mavinakayanahalli Move the locking-selftest infrastructure to tests/ Signed-off-by: Ananth N Mavinakayanahalli --- lib/locking-selftest-hardirq.h | 9 lib/locking-selftest-mutex.h | 11 lib/locking-selftest-rlock-hardirq.h | 2 lib/locking-selftest-rlock-softirq.h | 2 lib/locking-selftest-rlock.h | 14 lib/locking-selftest-rsem.h | 14 lib/locking-selftest-softirq.h | 9 lib/locking-selftest-spin-hardirq.h | 2 lib/locking-selftest-spin-softirq.h | 2 lib/locking-selftest-spin.h | 11 lib/locking-selftest-wlock-hardirq.h | 2 lib/locking-selftest-wlock-softirq.h | 2 lib/locking-selftest-wlock.h | 14 lib/locking-selftest-wsem.h | 14 lib/locking-selftest.c | 1218 --------------------------------- lib/Kconfig.debug | 11 lib/Makefile | 1 tests/Kconfig | 11 tests/Makefile | 2 tests/locking-selftest-hardirq.h | 9 tests/locking-selftest-mutex.h | 11 tests/locking-selftest-rlock-hardirq.h | 2 tests/locking-selftest-rlock-softirq.h | 2 tests/locking-selftest-rlock.h | 14 tests/locking-selftest-rsem.h | 14 tests/locking-selftest-softirq.h | 9 tests/locking-selftest-spin-hardirq.h | 2 tests/locking-selftest-spin-softirq.h | 2 tests/locking-selftest-spin.h | 11 tests/locking-selftest-wlock-hardirq.h | 2 tests/locking-selftest-wlock-softirq.h | 2 tests/locking-selftest-wlock.h | 14 tests/locking-selftest-wsem.h | 14 tests/locking-selftest.c | 1218 +++++++++++++++++++++++++++++++++ 34 files changed, 1339 insertions(+), 1338 deletions(-) Index: linux-2.6.24-rc6/lib/Makefile =================================================================== --- linux-2.6.24-rc6.orig/lib/Makefile +++ linux-2.6.24-rc6/lib/Makefile @@ -25,7 +25,6 @@ lib-$(CONFIG_HOTPLUG) += kobject_uevent. obj-$(CONFIG_GENERIC_IOMAP) += iomap.o obj-$(CONFIG_HAS_IOMEM) += iomap_copy.o devres.o obj-$(CONFIG_CHECK_SIGNATURE) += check_signature.o -obj-$(CONFIG_DEBUG_LOCKING_API_SELFTESTS) += locking-selftest.o obj-$(CONFIG_DEBUG_SPINLOCK) += spinlock_debug.o lib-$(CONFIG_RWSEM_GENERIC_SPINLOCK) += rwsem-spinlock.o lib-$(CONFIG_RWSEM_XCHGADD_ALGORITHM) += rwsem.o Index: linux-2.6.24-rc6/lib/locking-selftest-hardirq.h =================================================================== --- linux-2.6.24-rc6.orig/lib/locking-selftest-hardirq.h +++ /dev/null @@ -1,9 +0,0 @@ -#undef IRQ_DISABLE -#undef IRQ_ENABLE -#undef IRQ_ENTER -#undef IRQ_EXIT - -#define IRQ_ENABLE HARDIRQ_ENABLE -#define IRQ_DISABLE HARDIRQ_DISABLE -#define IRQ_ENTER HARDIRQ_ENTER -#define IRQ_EXIT HARDIRQ_EXIT Index: linux-2.6.24-rc6/lib/locking-selftest-mutex.h =================================================================== --- linux-2.6.24-rc6.orig/lib/locking-selftest-mutex.h +++ /dev/null @@ -1,11 +0,0 @@ -#undef LOCK -#define LOCK ML - -#undef UNLOCK -#define UNLOCK MU - -#undef RLOCK -#undef WLOCK - -#undef INIT -#define INIT MI Index: linux-2.6.24-rc6/lib/locking-selftest-rlock-hardirq.h =================================================================== --- linux-2.6.24-rc6.orig/lib/locking-selftest-rlock-hardirq.h +++ /dev/null @@ -1,2 +0,0 @@ -#include "locking-selftest-rlock.h" -#include "locking-selftest-hardirq.h" Index: linux-2.6.24-rc6/lib/locking-selftest-rlock-softirq.h =================================================================== --- linux-2.6.24-rc6.orig/lib/locking-selftest-rlock-softirq.h +++ /dev/null @@ -1,2 +0,0 @@ -#include "locking-selftest-rlock.h" -#include "locking-selftest-softirq.h" Index: linux-2.6.24-rc6/lib/locking-selftest-rlock.h =================================================================== --- linux-2.6.24-rc6.orig/lib/locking-selftest-rlock.h +++ /dev/null @@ -1,14 +0,0 @@ -#undef LOCK -#define LOCK RL - -#undef UNLOCK -#define UNLOCK RU - -#undef RLOCK -#define RLOCK RL - -#undef WLOCK -#define WLOCK WL - -#undef INIT -#define INIT RWI Index: linux-2.6.24-rc6/lib/locking-selftest-rsem.h =================================================================== --- linux-2.6.24-rc6.orig/lib/locking-selftest-rsem.h +++ /dev/null @@ -1,14 +0,0 @@ -#undef LOCK -#define LOCK RSL - -#undef UNLOCK -#define UNLOCK RSU - -#undef RLOCK -#define RLOCK RSL - -#undef WLOCK -#define WLOCK WSL - -#undef INIT -#define INIT RWSI Index: linux-2.6.24-rc6/lib/locking-selftest-softirq.h =================================================================== --- linux-2.6.24-rc6.orig/lib/locking-selftest-softirq.h +++ /dev/null @@ -1,9 +0,0 @@ -#undef IRQ_DISABLE -#undef IRQ_ENABLE -#undef IRQ_ENTER -#undef IRQ_EXIT - -#define IRQ_DISABLE SOFTIRQ_DISABLE -#define IRQ_ENABLE SOFTIRQ_ENABLE -#define IRQ_ENTER SOFTIRQ_ENTER -#define IRQ_EXIT SOFTIRQ_EXIT Index: linux-2.6.24-rc6/lib/locking-selftest-spin-hardirq.h =================================================================== --- linux-2.6.24-rc6.orig/lib/locking-selftest-spin-hardirq.h +++ /dev/null @@ -1,2 +0,0 @@ -#include "locking-selftest-spin.h" -#include "locking-selftest-hardirq.h" Index: linux-2.6.24-rc6/lib/locking-selftest-spin-softirq.h =================================================================== --- linux-2.6.24-rc6.orig/lib/locking-selftest-spin-softirq.h +++ /dev/null @@ -1,2 +0,0 @@ -#include "locking-selftest-spin.h" -#include "locking-selftest-softirq.h" Index: linux-2.6.24-rc6/lib/locking-selftest-spin.h =================================================================== --- linux-2.6.24-rc6.orig/lib/locking-selftest-spin.h +++ /dev/null @@ -1,11 +0,0 @@ -#undef LOCK -#define LOCK L - -#undef UNLOCK -#define UNLOCK U - -#undef RLOCK -#undef WLOCK - -#undef INIT -#define INIT SI Index: linux-2.6.24-rc6/lib/locking-selftest-wlock-hardirq.h =================================================================== --- linux-2.6.24-rc6.orig/lib/locking-selftest-wlock-hardirq.h +++ /dev/null @@ -1,2 +0,0 @@ -#include "locking-selftest-wlock.h" -#include "locking-selftest-hardirq.h" Index: linux-2.6.24-rc6/lib/locking-selftest-wlock-softirq.h =================================================================== --- linux-2.6.24-rc6.orig/lib/locking-selftest-wlock-softirq.h +++ /dev/null @@ -1,2 +0,0 @@ -#include "locking-selftest-wlock.h" -#include "locking-selftest-softirq.h" Index: linux-2.6.24-rc6/lib/locking-selftest-wlock.h =================================================================== --- linux-2.6.24-rc6.orig/lib/locking-selftest-wlock.h +++ /dev/null @@ -1,14 +0,0 @@ -#undef LOCK -#define LOCK WL - -#undef UNLOCK -#define UNLOCK WU - -#undef RLOCK -#define RLOCK RL - -#undef WLOCK -#define WLOCK WL - -#undef INIT -#define INIT RWI Index: linux-2.6.24-rc6/lib/locking-selftest-wsem.h =================================================================== --- linux-2.6.24-rc6.orig/lib/locking-selftest-wsem.h +++ /dev/null @@ -1,14 +0,0 @@ -#undef LOCK -#define LOCK WSL - -#undef UNLOCK -#define UNLOCK WSU - -#undef RLOCK -#define RLOCK RSL - -#undef WLOCK -#define WLOCK WSL - -#undef INIT -#define INIT RWSI Index: linux-2.6.24-rc6/lib/locking-selftest.c =================================================================== --- linux-2.6.24-rc6.orig/lib/locking-selftest.c +++ /dev/null @@ -1,1218 +0,0 @@ -/* - * lib/locking-selftest.c - * - * Testsuite for various locking APIs: spinlocks, rwlocks, - * mutexes and rw-semaphores. - * - * It is checking both false positives and false negatives. - * - * Started by Ingo Molnar: - * - * Copyright (C) 2006 Red Hat, Inc., Ingo Molnar - */ -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -/* - * Change this to 1 if you want to see the failure printouts: - */ -static unsigned int debug_locks_verbose; - -static int __init setup_debug_locks_verbose(char *str) -{ - get_option(&str, &debug_locks_verbose); - - return 1; -} - -__setup("debug_locks_verbose=", setup_debug_locks_verbose); - -#define FAILURE 0 -#define SUCCESS 1 - -#define LOCKTYPE_SPIN 0x1 -#define LOCKTYPE_RWLOCK 0x2 -#define LOCKTYPE_MUTEX 0x4 -#define LOCKTYPE_RWSEM 0x8 - -/* - * Normal standalone locks, for the circular and irq-context - * dependency tests: - */ -static DEFINE_SPINLOCK(lock_A); -static DEFINE_SPINLOCK(lock_B); -static DEFINE_SPINLOCK(lock_C); -static DEFINE_SPINLOCK(lock_D); - -static DEFINE_RWLOCK(rwlock_A); -static DEFINE_RWLOCK(rwlock_B); -static DEFINE_RWLOCK(rwlock_C); -static DEFINE_RWLOCK(rwlock_D); - -static DEFINE_MUTEX(mutex_A); -static DEFINE_MUTEX(mutex_B); -static DEFINE_MUTEX(mutex_C); -static DEFINE_MUTEX(mutex_D); - -static DECLARE_RWSEM(rwsem_A); -static DECLARE_RWSEM(rwsem_B); -static DECLARE_RWSEM(rwsem_C); -static DECLARE_RWSEM(rwsem_D); - -/* - * Locks that we initialize dynamically as well so that - * e.g. X1 and X2 becomes two instances of the same class, - * but X* and Y* are different classes. We do this so that - * we do not trigger a real lockup: - */ -static DEFINE_SPINLOCK(lock_X1); -static DEFINE_SPINLOCK(lock_X2); -static DEFINE_SPINLOCK(lock_Y1); -static DEFINE_SPINLOCK(lock_Y2); -static DEFINE_SPINLOCK(lock_Z1); -static DEFINE_SPINLOCK(lock_Z2); - -static DEFINE_RWLOCK(rwlock_X1); -static DEFINE_RWLOCK(rwlock_X2); -static DEFINE_RWLOCK(rwlock_Y1); -static DEFINE_RWLOCK(rwlock_Y2); -static DEFINE_RWLOCK(rwlock_Z1); -static DEFINE_RWLOCK(rwlock_Z2); - -static DEFINE_MUTEX(mutex_X1); -static DEFINE_MUTEX(mutex_X2); -static DEFINE_MUTEX(mutex_Y1); -static DEFINE_MUTEX(mutex_Y2); -static DEFINE_MUTEX(mutex_Z1); -static DEFINE_MUTEX(mutex_Z2); - -static DECLARE_RWSEM(rwsem_X1); -static DECLARE_RWSEM(rwsem_X2); -static DECLARE_RWSEM(rwsem_Y1); -static DECLARE_RWSEM(rwsem_Y2); -static DECLARE_RWSEM(rwsem_Z1); -static DECLARE_RWSEM(rwsem_Z2); - -/* - * non-inlined runtime initializers, to let separate locks share - * the same lock-class: - */ -#define INIT_CLASS_FUNC(class) \ -static noinline void \ -init_class_##class(spinlock_t *lock, rwlock_t *rwlock, struct mutex *mutex, \ - struct rw_semaphore *rwsem) \ -{ \ - spin_lock_init(lock); \ - rwlock_init(rwlock); \ - mutex_init(mutex); \ - init_rwsem(rwsem); \ -} - -INIT_CLASS_FUNC(X) -INIT_CLASS_FUNC(Y) -INIT_CLASS_FUNC(Z) - -static void init_shared_classes(void) -{ - init_class_X(&lock_X1, &rwlock_X1, &mutex_X1, &rwsem_X1); - init_class_X(&lock_X2, &rwlock_X2, &mutex_X2, &rwsem_X2); - - init_class_Y(&lock_Y1, &rwlock_Y1, &mutex_Y1, &rwsem_Y1); - init_class_Y(&lock_Y2, &rwlock_Y2, &mutex_Y2, &rwsem_Y2); - - init_class_Z(&lock_Z1, &rwlock_Z1, &mutex_Z1, &rwsem_Z1); - init_class_Z(&lock_Z2, &rwlock_Z2, &mutex_Z2, &rwsem_Z2); -} - -/* - * For spinlocks and rwlocks we also do hardirq-safe / softirq-safe tests. - * The following functions use a lock from a simulated hardirq/softirq - * context, causing the locks to be marked as hardirq-safe/softirq-safe: - */ - -#define HARDIRQ_DISABLE local_irq_disable -#define HARDIRQ_ENABLE local_irq_enable - -#define HARDIRQ_ENTER() \ - local_irq_disable(); \ - irq_enter(); \ - WARN_ON(!in_irq()); - -#define HARDIRQ_EXIT() \ - __irq_exit(); \ - local_irq_enable(); - -#define SOFTIRQ_DISABLE local_bh_disable -#define SOFTIRQ_ENABLE local_bh_enable - -#define SOFTIRQ_ENTER() \ - local_bh_disable(); \ - local_irq_disable(); \ - trace_softirq_enter(); \ - WARN_ON(!in_softirq()); - -#define SOFTIRQ_EXIT() \ - trace_softirq_exit(); \ - local_irq_enable(); \ - local_bh_enable(); - -/* - * Shortcuts for lock/unlock API variants, to keep - * the testcases compact: - */ -#define L(x) spin_lock(&lock_##x) -#define U(x) spin_unlock(&lock_##x) -#define LU(x) L(x); U(x) -#define SI(x) spin_lock_init(&lock_##x) - -#define WL(x) write_lock(&rwlock_##x) -#define WU(x) write_unlock(&rwlock_##x) -#define WLU(x) WL(x); WU(x) - -#define RL(x) read_lock(&rwlock_##x) -#define RU(x) read_unlock(&rwlock_##x) -#define RLU(x) RL(x); RU(x) -#define RWI(x) rwlock_init(&rwlock_##x) - -#define ML(x) mutex_lock(&mutex_##x) -#define MU(x) mutex_unlock(&mutex_##x) -#define MI(x) mutex_init(&mutex_##x) - -#define WSL(x) down_write(&rwsem_##x) -#define WSU(x) up_write(&rwsem_##x) - -#define RSL(x) down_read(&rwsem_##x) -#define RSU(x) up_read(&rwsem_##x) -#define RWSI(x) init_rwsem(&rwsem_##x) - -#define LOCK_UNLOCK_2(x,y) LOCK(x); LOCK(y); UNLOCK(y); UNLOCK(x) - -/* - * Generate different permutations of the same testcase, using - * the same basic lock-dependency/state events: - */ - -#define GENERATE_TESTCASE(name) \ - \ -static void name(void) { E(); } - -#define GENERATE_PERMUTATIONS_2_EVENTS(name) \ - \ -static void name##_12(void) { E1(); E2(); } \ -static void name##_21(void) { E2(); E1(); } - -#define GENERATE_PERMUTATIONS_3_EVENTS(name) \ - \ -static void name##_123(void) { E1(); E2(); E3(); } \ -static void name##_132(void) { E1(); E3(); E2(); } \ -static void name##_213(void) { E2(); E1(); E3(); } \ -static void name##_231(void) { E2(); E3(); E1(); } \ -static void name##_312(void) { E3(); E1(); E2(); } \ -static void name##_321(void) { E3(); E2(); E1(); } - -/* - * AA deadlock: - */ - -#define E() \ - \ - LOCK(X1); \ - LOCK(X2); /* this one should fail */ - -/* - * 6 testcases: - */ -#include "locking-selftest-spin.h" -GENERATE_TESTCASE(AA_spin) -#include "locking-selftest-wlock.h" -GENERATE_TESTCASE(AA_wlock) -#include "locking-selftest-rlock.h" -GENERATE_TESTCASE(AA_rlock) -#include "locking-selftest-mutex.h" -GENERATE_TESTCASE(AA_mutex) -#include "locking-selftest-wsem.h" -GENERATE_TESTCASE(AA_wsem) -#include "locking-selftest-rsem.h" -GENERATE_TESTCASE(AA_rsem) - -#undef E - -/* - * Special-case for read-locking, they are - * allowed to recurse on the same lock class: - */ -static void rlock_AA1(void) -{ - RL(X1); - RL(X1); // this one should NOT fail -} - -static void rlock_AA1B(void) -{ - RL(X1); - RL(X2); // this one should NOT fail -} - -static void rsem_AA1(void) -{ - RSL(X1); - RSL(X1); // this one should fail -} - -static void rsem_AA1B(void) -{ - RSL(X1); - RSL(X2); // this one should fail -} -/* - * The mixing of read and write locks is not allowed: - */ -static void rlock_AA2(void) -{ - RL(X1); - WL(X2); // this one should fail -} - -static void rsem_AA2(void) -{ - RSL(X1); - WSL(X2); // this one should fail -} - -static void rlock_AA3(void) -{ - WL(X1); - RL(X2); // this one should fail -} - -static void rsem_AA3(void) -{ - WSL(X1); - RSL(X2); // this one should fail -} - -/* - * ABBA deadlock: - */ - -#define E() \ - \ - LOCK_UNLOCK_2(A, B); \ - LOCK_UNLOCK_2(B, A); /* fail */ - -/* - * 6 testcases: - */ -#include "locking-selftest-spin.h" -GENERATE_TESTCASE(ABBA_spin) -#include "locking-selftest-wlock.h" -GENERATE_TESTCASE(ABBA_wlock) -#include "locking-selftest-rlock.h" -GENERATE_TESTCASE(ABBA_rlock) -#include "locking-selftest-mutex.h" -GENERATE_TESTCASE(ABBA_mutex) -#include "locking-selftest-wsem.h" -GENERATE_TESTCASE(ABBA_wsem) -#include "locking-selftest-rsem.h" -GENERATE_TESTCASE(ABBA_rsem) - -#undef E - -/* - * AB BC CA deadlock: - */ - -#define E() \ - \ - LOCK_UNLOCK_2(A, B); \ - LOCK_UNLOCK_2(B, C); \ - LOCK_UNLOCK_2(C, A); /* fail */ - -/* - * 6 testcases: - */ -#include "locking-selftest-spin.h" -GENERATE_TESTCASE(ABBCCA_spin) -#include "locking-selftest-wlock.h" -GENERATE_TESTCASE(ABBCCA_wlock) -#include "locking-selftest-rlock.h" -GENERATE_TESTCASE(ABBCCA_rlock) -#include "locking-selftest-mutex.h" -GENERATE_TESTCASE(ABBCCA_mutex) -#include "locking-selftest-wsem.h" -GENERATE_TESTCASE(ABBCCA_wsem) -#include "locking-selftest-rsem.h" -GENERATE_TESTCASE(ABBCCA_rsem) - -#undef E - -/* - * AB CA BC deadlock: - */ - -#define E() \ - \ - LOCK_UNLOCK_2(A, B); \ - LOCK_UNLOCK_2(C, A); \ - LOCK_UNLOCK_2(B, C); /* fail */ - -/* - * 6 testcases: - */ -#include "locking-selftest-spin.h" -GENERATE_TESTCASE(ABCABC_spin) -#include "locking-selftest-wlock.h" -GENERATE_TESTCASE(ABCABC_wlock) -#include "locking-selftest-rlock.h" -GENERATE_TESTCASE(ABCABC_rlock) -#include "locking-selftest-mutex.h" -GENERATE_TESTCASE(ABCABC_mutex) -#include "locking-selftest-wsem.h" -GENERATE_TESTCASE(ABCABC_wsem) -#include "locking-selftest-rsem.h" -GENERATE_TESTCASE(ABCABC_rsem) - -#undef E - -/* - * AB BC CD DA deadlock: - */ - -#define E() \ - \ - LOCK_UNLOCK_2(A, B); \ - LOCK_UNLOCK_2(B, C); \ - LOCK_UNLOCK_2(C, D); \ - LOCK_UNLOCK_2(D, A); /* fail */ - -/* - * 6 testcases: - */ -#include "locking-selftest-spin.h" -GENERATE_TESTCASE(ABBCCDDA_spin) -#include "locking-selftest-wlock.h" -GENERATE_TESTCASE(ABBCCDDA_wlock) -#include "locking-selftest-rlock.h" -GENERATE_TESTCASE(ABBCCDDA_rlock) -#include "locking-selftest-mutex.h" -GENERATE_TESTCASE(ABBCCDDA_mutex) -#include "locking-selftest-wsem.h" -GENERATE_TESTCASE(ABBCCDDA_wsem) -#include "locking-selftest-rsem.h" -GENERATE_TESTCASE(ABBCCDDA_rsem) - -#undef E - -/* - * AB CD BD DA deadlock: - */ -#define E() \ - \ - LOCK_UNLOCK_2(A, B); \ - LOCK_UNLOCK_2(C, D); \ - LOCK_UNLOCK_2(B, D); \ - LOCK_UNLOCK_2(D, A); /* fail */ - -/* - * 6 testcases: - */ -#include "locking-selftest-spin.h" -GENERATE_TESTCASE(ABCDBDDA_spin) -#include "locking-selftest-wlock.h" -GENERATE_TESTCASE(ABCDBDDA_wlock) -#include "locking-selftest-rlock.h" -GENERATE_TESTCASE(ABCDBDDA_rlock) -#include "locking-selftest-mutex.h" -GENERATE_TESTCASE(ABCDBDDA_mutex) -#include "locking-selftest-wsem.h" -GENERATE_TESTCASE(ABCDBDDA_wsem) -#include "locking-selftest-rsem.h" -GENERATE_TESTCASE(ABCDBDDA_rsem) - -#undef E - -/* - * AB CD BC DA deadlock: - */ -#define E() \ - \ - LOCK_UNLOCK_2(A, B); \ - LOCK_UNLOCK_2(C, D); \ - LOCK_UNLOCK_2(B, C); \ - LOCK_UNLOCK_2(D, A); /* fail */ - -/* - * 6 testcases: - */ -#include "locking-selftest-spin.h" -GENERATE_TESTCASE(ABCDBCDA_spin) -#include "locking-selftest-wlock.h" -GENERATE_TESTCASE(ABCDBCDA_wlock) -#include "locking-selftest-rlock.h" -GENERATE_TESTCASE(ABCDBCDA_rlock) -#include "locking-selftest-mutex.h" -GENERATE_TESTCASE(ABCDBCDA_mutex) -#include "locking-selftest-wsem.h" -GENERATE_TESTCASE(ABCDBCDA_wsem) -#include "locking-selftest-rsem.h" -GENERATE_TESTCASE(ABCDBCDA_rsem) - -#undef E - -/* - * Double unlock: - */ -#define E() \ - \ - LOCK(A); \ - UNLOCK(A); \ - UNLOCK(A); /* fail */ - -/* - * 6 testcases: - */ -#include "locking-selftest-spin.h" -GENERATE_TESTCASE(double_unlock_spin) -#include "locking-selftest-wlock.h" -GENERATE_TESTCASE(double_unlock_wlock) -#include "locking-selftest-rlock.h" -GENERATE_TESTCASE(double_unlock_rlock) -#include "locking-selftest-mutex.h" -GENERATE_TESTCASE(double_unlock_mutex) -#include "locking-selftest-wsem.h" -GENERATE_TESTCASE(double_unlock_wsem) -#include "locking-selftest-rsem.h" -GENERATE_TESTCASE(double_unlock_rsem) - -#undef E - -/* - * Bad unlock ordering: - */ -#define E() \ - \ - LOCK(A); \ - LOCK(B); \ - UNLOCK(A); /* fail */ \ - UNLOCK(B); - -/* - * 6 testcases: - */ -#include "locking-selftest-spin.h" -GENERATE_TESTCASE(bad_unlock_order_spin) -#include "locking-selftest-wlock.h" -GENERATE_TESTCASE(bad_unlock_order_wlock) -#include "locking-selftest-rlock.h" -GENERATE_TESTCASE(bad_unlock_order_rlock) -#include "locking-selftest-mutex.h" -GENERATE_TESTCASE(bad_unlock_order_mutex) -#include "locking-selftest-wsem.h" -GENERATE_TESTCASE(bad_unlock_order_wsem) -#include "locking-selftest-rsem.h" -GENERATE_TESTCASE(bad_unlock_order_rsem) - -#undef E - -/* - * initializing a held lock: - */ -#define E() \ - \ - LOCK(A); \ - INIT(A); /* fail */ - -/* - * 6 testcases: - */ -#include "locking-selftest-spin.h" -GENERATE_TESTCASE(init_held_spin) -#include "locking-selftest-wlock.h" -GENERATE_TESTCASE(init_held_wlock) -#include "locking-selftest-rlock.h" -GENERATE_TESTCASE(init_held_rlock) -#include "locking-selftest-mutex.h" -GENERATE_TESTCASE(init_held_mutex) -#include "locking-selftest-wsem.h" -GENERATE_TESTCASE(init_held_wsem) -#include "locking-selftest-rsem.h" -GENERATE_TESTCASE(init_held_rsem) - -#undef E - -/* - * locking an irq-safe lock with irqs enabled: - */ -#define E1() \ - \ - IRQ_ENTER(); \ - LOCK(A); \ - UNLOCK(A); \ - IRQ_EXIT(); - -#define E2() \ - \ - LOCK(A); \ - UNLOCK(A); - -/* - * Generate 24 testcases: - */ -#include "locking-selftest-spin-hardirq.h" -GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_spin) - -#include "locking-selftest-rlock-hardirq.h" -GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_rlock) - -#include "locking-selftest-wlock-hardirq.h" -GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_wlock) - -#include "locking-selftest-spin-softirq.h" -GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_spin) - -#include "locking-selftest-rlock-softirq.h" -GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_rlock) - -#include "locking-selftest-wlock-softirq.h" -GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_wlock) - -#undef E1 -#undef E2 - -/* - * Enabling hardirqs with a softirq-safe lock held: - */ -#define E1() \ - \ - SOFTIRQ_ENTER(); \ - LOCK(A); \ - UNLOCK(A); \ - SOFTIRQ_EXIT(); - -#define E2() \ - \ - HARDIRQ_DISABLE(); \ - LOCK(A); \ - HARDIRQ_ENABLE(); \ - UNLOCK(A); - -/* - * Generate 12 testcases: - */ -#include "locking-selftest-spin.h" -GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_spin) - -#include "locking-selftest-wlock.h" -GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_wlock) - -#include "locking-selftest-rlock.h" -GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_rlock) - -#undef E1 -#undef E2 - -/* - * Enabling irqs with an irq-safe lock held: - */ -#define E1() \ - \ - IRQ_ENTER(); \ - LOCK(A); \ - UNLOCK(A); \ - IRQ_EXIT(); - -#define E2() \ - \ - IRQ_DISABLE(); \ - LOCK(A); \ - IRQ_ENABLE(); \ - UNLOCK(A); - -/* - * Generate 24 testcases: - */ -#include "locking-selftest-spin-hardirq.h" -GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_spin) - -#include "locking-selftest-rlock-hardirq.h" -GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_rlock) - -#include "locking-selftest-wlock-hardirq.h" -GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_wlock) - -#include "locking-selftest-spin-softirq.h" -GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_spin) - -#include "locking-selftest-rlock-softirq.h" -GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_rlock) - -#include "locking-selftest-wlock-softirq.h" -GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_wlock) - -#undef E1 -#undef E2 - -/* - * Acquiring a irq-unsafe lock while holding an irq-safe-lock: - */ -#define E1() \ - \ - LOCK(A); \ - LOCK(B); \ - UNLOCK(B); \ - UNLOCK(A); \ - -#define E2() \ - \ - LOCK(B); \ - UNLOCK(B); - -#define E3() \ - \ - IRQ_ENTER(); \ - LOCK(A); \ - UNLOCK(A); \ - IRQ_EXIT(); - -/* - * Generate 36 testcases: - */ -#include "locking-selftest-spin-hardirq.h" -GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_spin) - -#include "locking-selftest-rlock-hardirq.h" -GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_rlock) - -#include "locking-selftest-wlock-hardirq.h" -GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_wlock) - -#include "locking-selftest-spin-softirq.h" -GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_spin) - -#include "locking-selftest-rlock-softirq.h" -GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_rlock) - -#include "locking-selftest-wlock-softirq.h" -GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_wlock) - -#undef E1 -#undef E2 -#undef E3 - -/* - * If a lock turns into softirq-safe, but earlier it took - * a softirq-unsafe lock: - */ - -#define E1() \ - IRQ_DISABLE(); \ - LOCK(A); \ - LOCK(B); \ - UNLOCK(B); \ - UNLOCK(A); \ - IRQ_ENABLE(); - -#define E2() \ - LOCK(B); \ - UNLOCK(B); - -#define E3() \ - IRQ_ENTER(); \ - LOCK(A); \ - UNLOCK(A); \ - IRQ_EXIT(); - -/* - * Generate 36 testcases: - */ -#include "locking-selftest-spin-hardirq.h" -GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_spin) - -#include "locking-selftest-rlock-hardirq.h" -GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_rlock) - -#include "locking-selftest-wlock-hardirq.h" -GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_wlock) - -#include "locking-selftest-spin-softirq.h" -GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_spin) - -#include "locking-selftest-rlock-softirq.h" -GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_rlock) - -#include "locking-selftest-wlock-softirq.h" -GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_wlock) - -#undef E1 -#undef E2 -#undef E3 - -/* - * read-lock / write-lock irq inversion. - * - * Deadlock scenario: - * - * CPU#1 is at #1, i.e. it has write-locked A, but has not - * taken B yet. - * - * CPU#2 is at #2, i.e. it has locked B. - * - * Hardirq hits CPU#2 at point #2 and is trying to read-lock A. - * - * The deadlock occurs because CPU#1 will spin on B, and CPU#2 - * will spin on A. - */ - -#define E1() \ - \ - IRQ_DISABLE(); \ - WL(A); \ - LOCK(B); \ - UNLOCK(B); \ - WU(A); \ - IRQ_ENABLE(); - -#define E2() \ - \ - LOCK(B); \ - UNLOCK(B); - -#define E3() \ - \ - IRQ_ENTER(); \ - RL(A); \ - RU(A); \ - IRQ_EXIT(); - -/* - * Generate 36 testcases: - */ -#include "locking-selftest-spin-hardirq.h" -GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_spin) - -#include "locking-selftest-rlock-hardirq.h" -GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_rlock) - -#include "locking-selftest-wlock-hardirq.h" -GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_wlock) - -#include "locking-selftest-spin-softirq.h" -GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_spin) - -#include "locking-selftest-rlock-softirq.h" -GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_rlock) - -#include "locking-selftest-wlock-softirq.h" -GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_wlock) - -#undef E1 -#undef E2 -#undef E3 - -/* - * read-lock / write-lock recursion that is actually safe. - */ - -#define E1() \ - \ - IRQ_DISABLE(); \ - WL(A); \ - WU(A); \ - IRQ_ENABLE(); - -#define E2() \ - \ - RL(A); \ - RU(A); \ - -#define E3() \ - \ - IRQ_ENTER(); \ - RL(A); \ - L(B); \ - U(B); \ - RU(A); \ - IRQ_EXIT(); - -/* - * Generate 12 testcases: - */ -#include "locking-selftest-hardirq.h" -GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_hard) - -#include "locking-selftest-softirq.h" -GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_soft) - -#undef E1 -#undef E2 -#undef E3 - -/* - * read-lock / write-lock recursion that is unsafe. - */ - -#define E1() \ - \ - IRQ_DISABLE(); \ - L(B); \ - WL(A); \ - WU(A); \ - U(B); \ - IRQ_ENABLE(); - -#define E2() \ - \ - RL(A); \ - RU(A); \ - -#define E3() \ - \ - IRQ_ENTER(); \ - L(B); \ - U(B); \ - IRQ_EXIT(); - -/* - * Generate 12 testcases: - */ -#include "locking-selftest-hardirq.h" -// GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_hard) - -#include "locking-selftest-softirq.h" -// GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_soft) - -#ifdef CONFIG_DEBUG_LOCK_ALLOC -# define I_SPINLOCK(x) lockdep_reset_lock(&lock_##x.dep_map) -# define I_RWLOCK(x) lockdep_reset_lock(&rwlock_##x.dep_map) -# define I_MUTEX(x) lockdep_reset_lock(&mutex_##x.dep_map) -# define I_RWSEM(x) lockdep_reset_lock(&rwsem_##x.dep_map) -#else -# define I_SPINLOCK(x) -# define I_RWLOCK(x) -# define I_MUTEX(x) -# define I_RWSEM(x) -#endif - -#define I1(x) \ - do { \ - I_SPINLOCK(x); \ - I_RWLOCK(x); \ - I_MUTEX(x); \ - I_RWSEM(x); \ - } while (0) - -#define I2(x) \ - do { \ - spin_lock_init(&lock_##x); \ - rwlock_init(&rwlock_##x); \ - mutex_init(&mutex_##x); \ - init_rwsem(&rwsem_##x); \ - } while (0) - -static void reset_locks(void) -{ - local_irq_disable(); - I1(A); I1(B); I1(C); I1(D); - I1(X1); I1(X2); I1(Y1); I1(Y2); I1(Z1); I1(Z2); - lockdep_reset(); - I2(A); I2(B); I2(C); I2(D); - init_shared_classes(); - local_irq_enable(); -} - -#undef I - -static int testcase_total; -static int testcase_successes; -static int expected_testcase_failures; -static int unexpected_testcase_failures; - -static void dotest(void (*testcase_fn)(void), int expected, int lockclass_mask) -{ - unsigned long saved_preempt_count = preempt_count(); - int expected_failure = 0; - - WARN_ON(irqs_disabled()); - - testcase_fn(); - /* - * Filter out expected failures: - */ -#ifndef CONFIG_PROVE_LOCKING - if ((lockclass_mask & LOCKTYPE_SPIN) && debug_locks != expected) - expected_failure = 1; - if ((lockclass_mask & LOCKTYPE_RWLOCK) && debug_locks != expected) - expected_failure = 1; - if ((lockclass_mask & LOCKTYPE_MUTEX) && debug_locks != expected) - expected_failure = 1; - if ((lockclass_mask & LOCKTYPE_RWSEM) && debug_locks != expected) - expected_failure = 1; -#endif - if (debug_locks != expected) { - if (expected_failure) { - expected_testcase_failures++; - printk("failed|"); - } else { - unexpected_testcase_failures++; - - printk("FAILED|"); - dump_stack(); - } - } else { - testcase_successes++; - printk(" ok |"); - } - testcase_total++; - - if (debug_locks_verbose) - printk(" lockclass mask: %x, debug_locks: %d, expected: %d\n", - lockclass_mask, debug_locks, expected); - /* - * Some tests (e.g. double-unlock) might corrupt the preemption - * count, so restore it: - */ - preempt_count() = saved_preempt_count; -#ifdef CONFIG_TRACE_IRQFLAGS - if (softirq_count()) - current->softirqs_enabled = 0; - else - current->softirqs_enabled = 1; -#endif - - reset_locks(); -} - -static inline void print_testname(const char *testname) -{ - printk("%33s:", testname); -} - -#define DO_TESTCASE_1(desc, name, nr) \ - print_testname(desc"/"#nr); \ - dotest(name##_##nr, SUCCESS, LOCKTYPE_RWLOCK); \ - printk("\n"); - -#define DO_TESTCASE_1B(desc, name, nr) \ - print_testname(desc"/"#nr); \ - dotest(name##_##nr, FAILURE, LOCKTYPE_RWLOCK); \ - printk("\n"); - -#define DO_TESTCASE_3(desc, name, nr) \ - print_testname(desc"/"#nr); \ - dotest(name##_spin_##nr, FAILURE, LOCKTYPE_SPIN); \ - dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK); \ - dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK); \ - printk("\n"); - -#define DO_TESTCASE_3RW(desc, name, nr) \ - print_testname(desc"/"#nr); \ - dotest(name##_spin_##nr, FAILURE, LOCKTYPE_SPIN|LOCKTYPE_RWLOCK);\ - dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK); \ - dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK); \ - printk("\n"); - -#define DO_TESTCASE_6(desc, name) \ - print_testname(desc); \ - dotest(name##_spin, FAILURE, LOCKTYPE_SPIN); \ - dotest(name##_wlock, FAILURE, LOCKTYPE_RWLOCK); \ - dotest(name##_rlock, FAILURE, LOCKTYPE_RWLOCK); \ - dotest(name##_mutex, FAILURE, LOCKTYPE_MUTEX); \ - dotest(name##_wsem, FAILURE, LOCKTYPE_RWSEM); \ - dotest(name##_rsem, FAILURE, LOCKTYPE_RWSEM); \ - printk("\n"); - -#define DO_TESTCASE_6_SUCCESS(desc, name) \ - print_testname(desc); \ - dotest(name##_spin, SUCCESS, LOCKTYPE_SPIN); \ - dotest(name##_wlock, SUCCESS, LOCKTYPE_RWLOCK); \ - dotest(name##_rlock, SUCCESS, LOCKTYPE_RWLOCK); \ - dotest(name##_mutex, SUCCESS, LOCKTYPE_MUTEX); \ - dotest(name##_wsem, SUCCESS, LOCKTYPE_RWSEM); \ - dotest(name##_rsem, SUCCESS, LOCKTYPE_RWSEM); \ - printk("\n"); - -/* - * 'read' variant: rlocks must not trigger. - */ -#define DO_TESTCASE_6R(desc, name) \ - print_testname(desc); \ - dotest(name##_spin, FAILURE, LOCKTYPE_SPIN); \ - dotest(name##_wlock, FAILURE, LOCKTYPE_RWLOCK); \ - dotest(name##_rlock, SUCCESS, LOCKTYPE_RWLOCK); \ - dotest(name##_mutex, FAILURE, LOCKTYPE_MUTEX); \ - dotest(name##_wsem, FAILURE, LOCKTYPE_RWSEM); \ - dotest(name##_rsem, FAILURE, LOCKTYPE_RWSEM); \ - printk("\n"); - -#define DO_TESTCASE_2I(desc, name, nr) \ - DO_TESTCASE_1("hard-"desc, name##_hard, nr); \ - DO_TESTCASE_1("soft-"desc, name##_soft, nr); - -#define DO_TESTCASE_2IB(desc, name, nr) \ - DO_TESTCASE_1B("hard-"desc, name##_hard, nr); \ - DO_TESTCASE_1B("soft-"desc, name##_soft, nr); - -#define DO_TESTCASE_6I(desc, name, nr) \ - DO_TESTCASE_3("hard-"desc, name##_hard, nr); \ - DO_TESTCASE_3("soft-"desc, name##_soft, nr); - -#define DO_TESTCASE_6IRW(desc, name, nr) \ - DO_TESTCASE_3RW("hard-"desc, name##_hard, nr); \ - DO_TESTCASE_3RW("soft-"desc, name##_soft, nr); - -#define DO_TESTCASE_2x3(desc, name) \ - DO_TESTCASE_3(desc, name, 12); \ - DO_TESTCASE_3(desc, name, 21); - -#define DO_TESTCASE_2x6(desc, name) \ - DO_TESTCASE_6I(desc, name, 12); \ - DO_TESTCASE_6I(desc, name, 21); - -#define DO_TESTCASE_6x2(desc, name) \ - DO_TESTCASE_2I(desc, name, 123); \ - DO_TESTCASE_2I(desc, name, 132); \ - DO_TESTCASE_2I(desc, name, 213); \ - DO_TESTCASE_2I(desc, name, 231); \ - DO_TESTCASE_2I(desc, name, 312); \ - DO_TESTCASE_2I(desc, name, 321); - -#define DO_TESTCASE_6x2B(desc, name) \ - DO_TESTCASE_2IB(desc, name, 123); \ - DO_TESTCASE_2IB(desc, name, 132); \ - DO_TESTCASE_2IB(desc, name, 213); \ - DO_TESTCASE_2IB(desc, name, 231); \ - DO_TESTCASE_2IB(desc, name, 312); \ - DO_TESTCASE_2IB(desc, name, 321); - -#define DO_TESTCASE_6x6(desc, name) \ - DO_TESTCASE_6I(desc, name, 123); \ - DO_TESTCASE_6I(desc, name, 132); \ - DO_TESTCASE_6I(desc, name, 213); \ - DO_TESTCASE_6I(desc, name, 231); \ - DO_TESTCASE_6I(desc, name, 312); \ - DO_TESTCASE_6I(desc, name, 321); - -#define DO_TESTCASE_6x6RW(desc, name) \ - DO_TESTCASE_6IRW(desc, name, 123); \ - DO_TESTCASE_6IRW(desc, name, 132); \ - DO_TESTCASE_6IRW(desc, name, 213); \ - DO_TESTCASE_6IRW(desc, name, 231); \ - DO_TESTCASE_6IRW(desc, name, 312); \ - DO_TESTCASE_6IRW(desc, name, 321); - - -void locking_selftest(void) -{ - /* - * Got a locking failure before the selftest ran? - */ - if (!debug_locks) { - printk("----------------------------------\n"); - printk("| Locking API testsuite disabled |\n"); - printk("----------------------------------\n"); - return; - } - - /* - * Run the testsuite: - */ - printk("------------------------\n"); - printk("| Locking API testsuite:\n"); - printk("----------------------------------------------------------------------------\n"); - printk(" | spin |wlock |rlock |mutex | wsem | rsem |\n"); - printk(" --------------------------------------------------------------------------\n"); - - init_shared_classes(); - debug_locks_silent = !debug_locks_verbose; - - DO_TESTCASE_6R("A-A deadlock", AA); - DO_TESTCASE_6R("A-B-B-A deadlock", ABBA); - DO_TESTCASE_6R("A-B-B-C-C-A deadlock", ABBCCA); - DO_TESTCASE_6R("A-B-C-A-B-C deadlock", ABCABC); - DO_TESTCASE_6R("A-B-B-C-C-D-D-A deadlock", ABBCCDDA); - DO_TESTCASE_6R("A-B-C-D-B-D-D-A deadlock", ABCDBDDA); - DO_TESTCASE_6R("A-B-C-D-B-C-D-A deadlock", ABCDBCDA); - DO_TESTCASE_6("double unlock", double_unlock); - DO_TESTCASE_6("initialize held", init_held); - DO_TESTCASE_6_SUCCESS("bad unlock order", bad_unlock_order); - - printk(" --------------------------------------------------------------------------\n"); - print_testname("recursive read-lock"); - printk(" |"); - dotest(rlock_AA1, SUCCESS, LOCKTYPE_RWLOCK); - printk(" |"); - dotest(rsem_AA1, FAILURE, LOCKTYPE_RWSEM); - printk("\n"); - - print_testname("recursive read-lock #2"); - printk(" |"); - dotest(rlock_AA1B, SUCCESS, LOCKTYPE_RWLOCK); - printk(" |"); - dotest(rsem_AA1B, FAILURE, LOCKTYPE_RWSEM); - printk("\n"); - - print_testname("mixed read-write-lock"); - printk(" |"); - dotest(rlock_AA2, FAILURE, LOCKTYPE_RWLOCK); - printk(" |"); - dotest(rsem_AA2, FAILURE, LOCKTYPE_RWSEM); - printk("\n"); - - print_testname("mixed write-read-lock"); - printk(" |"); - dotest(rlock_AA3, FAILURE, LOCKTYPE_RWLOCK); - printk(" |"); - dotest(rsem_AA3, FAILURE, LOCKTYPE_RWSEM); - printk("\n"); - - printk(" --------------------------------------------------------------------------\n"); - - /* - * irq-context testcases: - */ - DO_TESTCASE_2x6("irqs-on + irq-safe-A", irqsafe1); - DO_TESTCASE_2x3("sirq-safe-A => hirqs-on", irqsafe2A); - DO_TESTCASE_2x6("safe-A + irqs-on", irqsafe2B); - DO_TESTCASE_6x6("safe-A + unsafe-B #1", irqsafe3); - DO_TESTCASE_6x6("safe-A + unsafe-B #2", irqsafe4); - DO_TESTCASE_6x6RW("irq lock-inversion", irq_inversion); - - DO_TESTCASE_6x2("irq read-recursion", irq_read_recursion); -// DO_TESTCASE_6x2B("irq read-recursion #2", irq_read_recursion2); - - if (unexpected_testcase_failures) { - printk("-----------------------------------------------------------------\n"); - debug_locks = 0; - printk("BUG: %3d unexpected failures (out of %3d) - debugging disabled! |\n", - unexpected_testcase_failures, testcase_total); - printk("-----------------------------------------------------------------\n"); - } else if (expected_testcase_failures && testcase_successes) { - printk("--------------------------------------------------------\n"); - printk("%3d out of %3d testcases failed, as expected. |\n", - expected_testcase_failures, testcase_total); - printk("----------------------------------------------------\n"); - debug_locks = 1; - } else if (expected_testcase_failures && !testcase_successes) { - printk("--------------------------------------------------------\n"); - printk("All %3d testcases failed, as expected. |\n", - expected_testcase_failures); - printk("----------------------------------------\n"); - debug_locks = 1; - } else { - printk("-------------------------------------------------------\n"); - printk("Good, all %3d testcases passed! |\n", - testcase_successes); - printk("---------------------------------\n"); - debug_locks = 1; - } - debug_locks_silent = 0; -} Index: linux-2.6.24-rc6/tests/Kconfig =================================================================== --- linux-2.6.24-rc6.orig/tests/Kconfig +++ linux-2.6.24-rc6/tests/Kconfig @@ -7,5 +7,16 @@ menuconfig KERNEL_TESTS if KERNEL_TESTS +config DEBUG_LOCKING_API_SELFTESTS + bool "Locking API boot-time self-tests" + depends on DEBUG_KERNEL + help + Say Y here if you want the kernel to run a short self-test during + bootup. The self-test checks whether common types of locking bugs + are detected by debugging mechanisms or not. (if you disable + lock debugging then those bugs wont be detected of course.) + The following locking APIs are covered: spinlocks, rwlocks, + mutexes and rwsems. + endif # KERNEL_TESTS Index: linux-2.6.24-rc6/tests/Makefile =================================================================== --- linux-2.6.24-rc6.orig/tests/Makefile +++ linux-2.6.24-rc6/tests/Makefile @@ -1,3 +1,5 @@ # # Makefile for kernel subsystem specific tests # + +obj-$(CONFIG_DEBUG_LOCKING_API_SELFTESTS) += locking-selftest.o Index: linux-2.6.24-rc6/tests/locking-selftest-hardirq.h =================================================================== --- /dev/null +++ linux-2.6.24-rc6/tests/locking-selftest-hardirq.h @@ -0,0 +1,9 @@ +#undef IRQ_DISABLE +#undef IRQ_ENABLE +#undef IRQ_ENTER +#undef IRQ_EXIT + +#define IRQ_ENABLE HARDIRQ_ENABLE +#define IRQ_DISABLE HARDIRQ_DISABLE +#define IRQ_ENTER HARDIRQ_ENTER +#define IRQ_EXIT HARDIRQ_EXIT Index: linux-2.6.24-rc6/tests/locking-selftest-mutex.h =================================================================== --- /dev/null +++ linux-2.6.24-rc6/tests/locking-selftest-mutex.h @@ -0,0 +1,11 @@ +#undef LOCK +#define LOCK ML + +#undef UNLOCK +#define UNLOCK MU + +#undef RLOCK +#undef WLOCK + +#undef INIT +#define INIT MI Index: linux-2.6.24-rc6/tests/locking-selftest-rlock-hardirq.h =================================================================== --- /dev/null +++ linux-2.6.24-rc6/tests/locking-selftest-rlock-hardirq.h @@ -0,0 +1,2 @@ +#include "locking-selftest-rlock.h" +#include "locking-selftest-hardirq.h" Index: linux-2.6.24-rc6/tests/locking-selftest-rlock-softirq.h =================================================================== --- /dev/null +++ linux-2.6.24-rc6/tests/locking-selftest-rlock-softirq.h @@ -0,0 +1,2 @@ +#include "locking-selftest-rlock.h" +#include "locking-selftest-softirq.h" Index: linux-2.6.24-rc6/tests/locking-selftest-rlock.h =================================================================== --- /dev/null +++ linux-2.6.24-rc6/tests/locking-selftest-rlock.h @@ -0,0 +1,14 @@ +#undef LOCK +#define LOCK RL + +#undef UNLOCK +#define UNLOCK RU + +#undef RLOCK +#define RLOCK RL + +#undef WLOCK +#define WLOCK WL + +#undef INIT +#define INIT RWI Index: linux-2.6.24-rc6/tests/locking-selftest-rsem.h =================================================================== --- /dev/null +++ linux-2.6.24-rc6/tests/locking-selftest-rsem.h @@ -0,0 +1,14 @@ +#undef LOCK +#define LOCK RSL + +#undef UNLOCK +#define UNLOCK RSU + +#undef RLOCK +#define RLOCK RSL + +#undef WLOCK +#define WLOCK WSL + +#undef INIT +#define INIT RWSI Index: linux-2.6.24-rc6/tests/locking-selftest-softirq.h =================================================================== --- /dev/null +++ linux-2.6.24-rc6/tests/locking-selftest-softirq.h @@ -0,0 +1,9 @@ +#undef IRQ_DISABLE +#undef IRQ_ENABLE +#undef IRQ_ENTER +#undef IRQ_EXIT + +#define IRQ_DISABLE SOFTIRQ_DISABLE +#define IRQ_ENABLE SOFTIRQ_ENABLE +#define IRQ_ENTER SOFTIRQ_ENTER +#define IRQ_EXIT SOFTIRQ_EXIT Index: linux-2.6.24-rc6/tests/locking-selftest-spin-hardirq.h =================================================================== --- /dev/null +++ linux-2.6.24-rc6/tests/locking-selftest-spin-hardirq.h @@ -0,0 +1,2 @@ +#include "locking-selftest-spin.h" +#include "locking-selftest-hardirq.h" Index: linux-2.6.24-rc6/tests/locking-selftest-spin-softirq.h =================================================================== --- /dev/null +++ linux-2.6.24-rc6/tests/locking-selftest-spin-softirq.h @@ -0,0 +1,2 @@ +#include "locking-selftest-spin.h" +#include "locking-selftest-softirq.h" Index: linux-2.6.24-rc6/tests/locking-selftest-spin.h =================================================================== --- /dev/null +++ linux-2.6.24-rc6/tests/locking-selftest-spin.h @@ -0,0 +1,11 @@ +#undef LOCK +#define LOCK L + +#undef UNLOCK +#define UNLOCK U + +#undef RLOCK +#undef WLOCK + +#undef INIT +#define INIT SI Index: linux-2.6.24-rc6/tests/locking-selftest-wlock-hardirq.h =================================================================== --- /dev/null +++ linux-2.6.24-rc6/tests/locking-selftest-wlock-hardirq.h @@ -0,0 +1,2 @@ +#include "locking-selftest-wlock.h" +#include "locking-selftest-hardirq.h" Index: linux-2.6.24-rc6/tests/locking-selftest-wlock-softirq.h =================================================================== --- /dev/null +++ linux-2.6.24-rc6/tests/locking-selftest-wlock-softirq.h @@ -0,0 +1,2 @@ +#include "locking-selftest-wlock.h" +#include "locking-selftest-softirq.h" Index: linux-2.6.24-rc6/tests/locking-selftest-wlock.h =================================================================== --- /dev/null +++ linux-2.6.24-rc6/tests/locking-selftest-wlock.h @@ -0,0 +1,14 @@ +#undef LOCK +#define LOCK WL + +#undef UNLOCK +#define UNLOCK WU + +#undef RLOCK +#define RLOCK RL + +#undef WLOCK +#define WLOCK WL + +#undef INIT +#define INIT RWI Index: linux-2.6.24-rc6/tests/locking-selftest-wsem.h =================================================================== --- /dev/null +++ linux-2.6.24-rc6/tests/locking-selftest-wsem.h @@ -0,0 +1,14 @@ +#undef LOCK +#define LOCK WSL + +#undef UNLOCK +#define UNLOCK WSU + +#undef RLOCK +#define RLOCK RSL + +#undef WLOCK +#define WLOCK WSL + +#undef INIT +#define INIT RWSI Index: linux-2.6.24-rc6/tests/locking-selftest.c =================================================================== --- /dev/null +++ linux-2.6.24-rc6/tests/locking-selftest.c @@ -0,0 +1,1218 @@ +/* + * lib/locking-selftest.c + * + * Testsuite for various locking APIs: spinlocks, rwlocks, + * mutexes and rw-semaphores. + * + * It is checking both false positives and false negatives. + * + * Started by Ingo Molnar: + * + * Copyright (C) 2006 Red Hat, Inc., Ingo Molnar + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* + * Change this to 1 if you want to see the failure printouts: + */ +static unsigned int debug_locks_verbose; + +static int __init setup_debug_locks_verbose(char *str) +{ + get_option(&str, &debug_locks_verbose); + + return 1; +} + +__setup("debug_locks_verbose=", setup_debug_locks_verbose); + +#define FAILURE 0 +#define SUCCESS 1 + +#define LOCKTYPE_SPIN 0x1 +#define LOCKTYPE_RWLOCK 0x2 +#define LOCKTYPE_MUTEX 0x4 +#define LOCKTYPE_RWSEM 0x8 + +/* + * Normal standalone locks, for the circular and irq-context + * dependency tests: + */ +static DEFINE_SPINLOCK(lock_A); +static DEFINE_SPINLOCK(lock_B); +static DEFINE_SPINLOCK(lock_C); +static DEFINE_SPINLOCK(lock_D); + +static DEFINE_RWLOCK(rwlock_A); +static DEFINE_RWLOCK(rwlock_B); +static DEFINE_RWLOCK(rwlock_C); +static DEFINE_RWLOCK(rwlock_D); + +static DEFINE_MUTEX(mutex_A); +static DEFINE_MUTEX(mutex_B); +static DEFINE_MUTEX(mutex_C); +static DEFINE_MUTEX(mutex_D); + +static DECLARE_RWSEM(rwsem_A); +static DECLARE_RWSEM(rwsem_B); +static DECLARE_RWSEM(rwsem_C); +static DECLARE_RWSEM(rwsem_D); + +/* + * Locks that we initialize dynamically as well so that + * e.g. X1 and X2 becomes two instances of the same class, + * but X* and Y* are different classes. We do this so that + * we do not trigger a real lockup: + */ +static DEFINE_SPINLOCK(lock_X1); +static DEFINE_SPINLOCK(lock_X2); +static DEFINE_SPINLOCK(lock_Y1); +static DEFINE_SPINLOCK(lock_Y2); +static DEFINE_SPINLOCK(lock_Z1); +static DEFINE_SPINLOCK(lock_Z2); + +static DEFINE_RWLOCK(rwlock_X1); +static DEFINE_RWLOCK(rwlock_X2); +static DEFINE_RWLOCK(rwlock_Y1); +static DEFINE_RWLOCK(rwlock_Y2); +static DEFINE_RWLOCK(rwlock_Z1); +static DEFINE_RWLOCK(rwlock_Z2); + +static DEFINE_MUTEX(mutex_X1); +static DEFINE_MUTEX(mutex_X2); +static DEFINE_MUTEX(mutex_Y1); +static DEFINE_MUTEX(mutex_Y2); +static DEFINE_MUTEX(mutex_Z1); +static DEFINE_MUTEX(mutex_Z2); + +static DECLARE_RWSEM(rwsem_X1); +static DECLARE_RWSEM(rwsem_X2); +static DECLARE_RWSEM(rwsem_Y1); +static DECLARE_RWSEM(rwsem_Y2); +static DECLARE_RWSEM(rwsem_Z1); +static DECLARE_RWSEM(rwsem_Z2); + +/* + * non-inlined runtime initializers, to let separate locks share + * the same lock-class: + */ +#define INIT_CLASS_FUNC(class) \ +static noinline void \ +init_class_##class(spinlock_t *lock, rwlock_t *rwlock, struct mutex *mutex, \ + struct rw_semaphore *rwsem) \ +{ \ + spin_lock_init(lock); \ + rwlock_init(rwlock); \ + mutex_init(mutex); \ + init_rwsem(rwsem); \ +} + +INIT_CLASS_FUNC(X) +INIT_CLASS_FUNC(Y) +INIT_CLASS_FUNC(Z) + +static void init_shared_classes(void) +{ + init_class_X(&lock_X1, &rwlock_X1, &mutex_X1, &rwsem_X1); + init_class_X(&lock_X2, &rwlock_X2, &mutex_X2, &rwsem_X2); + + init_class_Y(&lock_Y1, &rwlock_Y1, &mutex_Y1, &rwsem_Y1); + init_class_Y(&lock_Y2, &rwlock_Y2, &mutex_Y2, &rwsem_Y2); + + init_class_Z(&lock_Z1, &rwlock_Z1, &mutex_Z1, &rwsem_Z1); + init_class_Z(&lock_Z2, &rwlock_Z2, &mutex_Z2, &rwsem_Z2); +} + +/* + * For spinlocks and rwlocks we also do hardirq-safe / softirq-safe tests. + * The following functions use a lock from a simulated hardirq/softirq + * context, causing the locks to be marked as hardirq-safe/softirq-safe: + */ + +#define HARDIRQ_DISABLE local_irq_disable +#define HARDIRQ_ENABLE local_irq_enable + +#define HARDIRQ_ENTER() \ + local_irq_disable(); \ + irq_enter(); \ + WARN_ON(!in_irq()); + +#define HARDIRQ_EXIT() \ + __irq_exit(); \ + local_irq_enable(); + +#define SOFTIRQ_DISABLE local_bh_disable +#define SOFTIRQ_ENABLE local_bh_enable + +#define SOFTIRQ_ENTER() \ + local_bh_disable(); \ + local_irq_disable(); \ + trace_softirq_enter(); \ + WARN_ON(!in_softirq()); + +#define SOFTIRQ_EXIT() \ + trace_softirq_exit(); \ + local_irq_enable(); \ + local_bh_enable(); + +/* + * Shortcuts for lock/unlock API variants, to keep + * the testcases compact: + */ +#define L(x) spin_lock(&lock_##x) +#define U(x) spin_unlock(&lock_##x) +#define LU(x) L(x); U(x) +#define SI(x) spin_lock_init(&lock_##x) + +#define WL(x) write_lock(&rwlock_##x) +#define WU(x) write_unlock(&rwlock_##x) +#define WLU(x) WL(x); WU(x) + +#define RL(x) read_lock(&rwlock_##x) +#define RU(x) read_unlock(&rwlock_##x) +#define RLU(x) RL(x); RU(x) +#define RWI(x) rwlock_init(&rwlock_##x) + +#define ML(x) mutex_lock(&mutex_##x) +#define MU(x) mutex_unlock(&mutex_##x) +#define MI(x) mutex_init(&mutex_##x) + +#define WSL(x) down_write(&rwsem_##x) +#define WSU(x) up_write(&rwsem_##x) + +#define RSL(x) down_read(&rwsem_##x) +#define RSU(x) up_read(&rwsem_##x) +#define RWSI(x) init_rwsem(&rwsem_##x) + +#define LOCK_UNLOCK_2(x,y) LOCK(x); LOCK(y); UNLOCK(y); UNLOCK(x) + +/* + * Generate different permutations of the same testcase, using + * the same basic lock-dependency/state events: + */ + +#define GENERATE_TESTCASE(name) \ + \ +static void name(void) { E(); } + +#define GENERATE_PERMUTATIONS_2_EVENTS(name) \ + \ +static void name##_12(void) { E1(); E2(); } \ +static void name##_21(void) { E2(); E1(); } + +#define GENERATE_PERMUTATIONS_3_EVENTS(name) \ + \ +static void name##_123(void) { E1(); E2(); E3(); } \ +static void name##_132(void) { E1(); E3(); E2(); } \ +static void name##_213(void) { E2(); E1(); E3(); } \ +static void name##_231(void) { E2(); E3(); E1(); } \ +static void name##_312(void) { E3(); E1(); E2(); } \ +static void name##_321(void) { E3(); E2(); E1(); } + +/* + * AA deadlock: + */ + +#define E() \ + \ + LOCK(X1); \ + LOCK(X2); /* this one should fail */ + +/* + * 6 testcases: + */ +#include "locking-selftest-spin.h" +GENERATE_TESTCASE(AA_spin) +#include "locking-selftest-wlock.h" +GENERATE_TESTCASE(AA_wlock) +#include "locking-selftest-rlock.h" +GENERATE_TESTCASE(AA_rlock) +#include "locking-selftest-mutex.h" +GENERATE_TESTCASE(AA_mutex) +#include "locking-selftest-wsem.h" +GENERATE_TESTCASE(AA_wsem) +#include "locking-selftest-rsem.h" +GENERATE_TESTCASE(AA_rsem) + +#undef E + +/* + * Special-case for read-locking, they are + * allowed to recurse on the same lock class: + */ +static void rlock_AA1(void) +{ + RL(X1); + RL(X1); // this one should NOT fail +} + +static void rlock_AA1B(void) +{ + RL(X1); + RL(X2); // this one should NOT fail +} + +static void rsem_AA1(void) +{ + RSL(X1); + RSL(X1); // this one should fail +} + +static void rsem_AA1B(void) +{ + RSL(X1); + RSL(X2); // this one should fail +} +/* + * The mixing of read and write locks is not allowed: + */ +static void rlock_AA2(void) +{ + RL(X1); + WL(X2); // this one should fail +} + +static void rsem_AA2(void) +{ + RSL(X1); + WSL(X2); // this one should fail +} + +static void rlock_AA3(void) +{ + WL(X1); + RL(X2); // this one should fail +} + +static void rsem_AA3(void) +{ + WSL(X1); + RSL(X2); // this one should fail +} + +/* + * ABBA deadlock: + */ + +#define E() \ + \ + LOCK_UNLOCK_2(A, B); \ + LOCK_UNLOCK_2(B, A); /* fail */ + +/* + * 6 testcases: + */ +#include "locking-selftest-spin.h" +GENERATE_TESTCASE(ABBA_spin) +#include "locking-selftest-wlock.h" +GENERATE_TESTCASE(ABBA_wlock) +#include "locking-selftest-rlock.h" +GENERATE_TESTCASE(ABBA_rlock) +#include "locking-selftest-mutex.h" +GENERATE_TESTCASE(ABBA_mutex) +#include "locking-selftest-wsem.h" +GENERATE_TESTCASE(ABBA_wsem) +#include "locking-selftest-rsem.h" +GENERATE_TESTCASE(ABBA_rsem) + +#undef E + +/* + * AB BC CA deadlock: + */ + +#define E() \ + \ + LOCK_UNLOCK_2(A, B); \ + LOCK_UNLOCK_2(B, C); \ + LOCK_UNLOCK_2(C, A); /* fail */ + +/* + * 6 testcases: + */ +#include "locking-selftest-spin.h" +GENERATE_TESTCASE(ABBCCA_spin) +#include "locking-selftest-wlock.h" +GENERATE_TESTCASE(ABBCCA_wlock) +#include "locking-selftest-rlock.h" +GENERATE_TESTCASE(ABBCCA_rlock) +#include "locking-selftest-mutex.h" +GENERATE_TESTCASE(ABBCCA_mutex) +#include "locking-selftest-wsem.h" +GENERATE_TESTCASE(ABBCCA_wsem) +#include "locking-selftest-rsem.h" +GENERATE_TESTCASE(ABBCCA_rsem) + +#undef E + +/* + * AB CA BC deadlock: + */ + +#define E() \ + \ + LOCK_UNLOCK_2(A, B); \ + LOCK_UNLOCK_2(C, A); \ + LOCK_UNLOCK_2(B, C); /* fail */ + +/* + * 6 testcases: + */ +#include "locking-selftest-spin.h" +GENERATE_TESTCASE(ABCABC_spin) +#include "locking-selftest-wlock.h" +GENERATE_TESTCASE(ABCABC_wlock) +#include "locking-selftest-rlock.h" +GENERATE_TESTCASE(ABCABC_rlock) +#include "locking-selftest-mutex.h" +GENERATE_TESTCASE(ABCABC_mutex) +#include "locking-selftest-wsem.h" +GENERATE_TESTCASE(ABCABC_wsem) +#include "locking-selftest-rsem.h" +GENERATE_TESTCASE(ABCABC_rsem) + +#undef E + +/* + * AB BC CD DA deadlock: + */ + +#define E() \ + \ + LOCK_UNLOCK_2(A, B); \ + LOCK_UNLOCK_2(B, C); \ + LOCK_UNLOCK_2(C, D); \ + LOCK_UNLOCK_2(D, A); /* fail */ + +/* + * 6 testcases: + */ +#include "locking-selftest-spin.h" +GENERATE_TESTCASE(ABBCCDDA_spin) +#include "locking-selftest-wlock.h" +GENERATE_TESTCASE(ABBCCDDA_wlock) +#include "locking-selftest-rlock.h" +GENERATE_TESTCASE(ABBCCDDA_rlock) +#include "locking-selftest-mutex.h" +GENERATE_TESTCASE(ABBCCDDA_mutex) +#include "locking-selftest-wsem.h" +GENERATE_TESTCASE(ABBCCDDA_wsem) +#include "locking-selftest-rsem.h" +GENERATE_TESTCASE(ABBCCDDA_rsem) + +#undef E + +/* + * AB CD BD DA deadlock: + */ +#define E() \ + \ + LOCK_UNLOCK_2(A, B); \ + LOCK_UNLOCK_2(C, D); \ + LOCK_UNLOCK_2(B, D); \ + LOCK_UNLOCK_2(D, A); /* fail */ + +/* + * 6 testcases: + */ +#include "locking-selftest-spin.h" +GENERATE_TESTCASE(ABCDBDDA_spin) +#include "locking-selftest-wlock.h" +GENERATE_TESTCASE(ABCDBDDA_wlock) +#include "locking-selftest-rlock.h" +GENERATE_TESTCASE(ABCDBDDA_rlock) +#include "locking-selftest-mutex.h" +GENERATE_TESTCASE(ABCDBDDA_mutex) +#include "locking-selftest-wsem.h" +GENERATE_TESTCASE(ABCDBDDA_wsem) +#include "locking-selftest-rsem.h" +GENERATE_TESTCASE(ABCDBDDA_rsem) + +#undef E + +/* + * AB CD BC DA deadlock: + */ +#define E() \ + \ + LOCK_UNLOCK_2(A, B); \ + LOCK_UNLOCK_2(C, D); \ + LOCK_UNLOCK_2(B, C); \ + LOCK_UNLOCK_2(D, A); /* fail */ + +/* + * 6 testcases: + */ +#include "locking-selftest-spin.h" +GENERATE_TESTCASE(ABCDBCDA_spin) +#include "locking-selftest-wlock.h" +GENERATE_TESTCASE(ABCDBCDA_wlock) +#include "locking-selftest-rlock.h" +GENERATE_TESTCASE(ABCDBCDA_rlock) +#include "locking-selftest-mutex.h" +GENERATE_TESTCASE(ABCDBCDA_mutex) +#include "locking-selftest-wsem.h" +GENERATE_TESTCASE(ABCDBCDA_wsem) +#include "locking-selftest-rsem.h" +GENERATE_TESTCASE(ABCDBCDA_rsem) + +#undef E + +/* + * Double unlock: + */ +#define E() \ + \ + LOCK(A); \ + UNLOCK(A); \ + UNLOCK(A); /* fail */ + +/* + * 6 testcases: + */ +#include "locking-selftest-spin.h" +GENERATE_TESTCASE(double_unlock_spin) +#include "locking-selftest-wlock.h" +GENERATE_TESTCASE(double_unlock_wlock) +#include "locking-selftest-rlock.h" +GENERATE_TESTCASE(double_unlock_rlock) +#include "locking-selftest-mutex.h" +GENERATE_TESTCASE(double_unlock_mutex) +#include "locking-selftest-wsem.h" +GENERATE_TESTCASE(double_unlock_wsem) +#include "locking-selftest-rsem.h" +GENERATE_TESTCASE(double_unlock_rsem) + +#undef E + +/* + * Bad unlock ordering: + */ +#define E() \ + \ + LOCK(A); \ + LOCK(B); \ + UNLOCK(A); /* fail */ \ + UNLOCK(B); + +/* + * 6 testcases: + */ +#include "locking-selftest-spin.h" +GENERATE_TESTCASE(bad_unlock_order_spin) +#include "locking-selftest-wlock.h" +GENERATE_TESTCASE(bad_unlock_order_wlock) +#include "locking-selftest-rlock.h" +GENERATE_TESTCASE(bad_unlock_order_rlock) +#include "locking-selftest-mutex.h" +GENERATE_TESTCASE(bad_unlock_order_mutex) +#include "locking-selftest-wsem.h" +GENERATE_TESTCASE(bad_unlock_order_wsem) +#include "locking-selftest-rsem.h" +GENERATE_TESTCASE(bad_unlock_order_rsem) + +#undef E + +/* + * initializing a held lock: + */ +#define E() \ + \ + LOCK(A); \ + INIT(A); /* fail */ + +/* + * 6 testcases: + */ +#include "locking-selftest-spin.h" +GENERATE_TESTCASE(init_held_spin) +#include "locking-selftest-wlock.h" +GENERATE_TESTCASE(init_held_wlock) +#include "locking-selftest-rlock.h" +GENERATE_TESTCASE(init_held_rlock) +#include "locking-selftest-mutex.h" +GENERATE_TESTCASE(init_held_mutex) +#include "locking-selftest-wsem.h" +GENERATE_TESTCASE(init_held_wsem) +#include "locking-selftest-rsem.h" +GENERATE_TESTCASE(init_held_rsem) + +#undef E + +/* + * locking an irq-safe lock with irqs enabled: + */ +#define E1() \ + \ + IRQ_ENTER(); \ + LOCK(A); \ + UNLOCK(A); \ + IRQ_EXIT(); + +#define E2() \ + \ + LOCK(A); \ + UNLOCK(A); + +/* + * Generate 24 testcases: + */ +#include "locking-selftest-spin-hardirq.h" +GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_spin) + +#include "locking-selftest-rlock-hardirq.h" +GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_rlock) + +#include "locking-selftest-wlock-hardirq.h" +GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_wlock) + +#include "locking-selftest-spin-softirq.h" +GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_spin) + +#include "locking-selftest-rlock-softirq.h" +GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_rlock) + +#include "locking-selftest-wlock-softirq.h" +GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_wlock) + +#undef E1 +#undef E2 + +/* + * Enabling hardirqs with a softirq-safe lock held: + */ +#define E1() \ + \ + SOFTIRQ_ENTER(); \ + LOCK(A); \ + UNLOCK(A); \ + SOFTIRQ_EXIT(); + +#define E2() \ + \ + HARDIRQ_DISABLE(); \ + LOCK(A); \ + HARDIRQ_ENABLE(); \ + UNLOCK(A); + +/* + * Generate 12 testcases: + */ +#include "locking-selftest-spin.h" +GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_spin) + +#include "locking-selftest-wlock.h" +GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_wlock) + +#include "locking-selftest-rlock.h" +GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_rlock) + +#undef E1 +#undef E2 + +/* + * Enabling irqs with an irq-safe lock held: + */ +#define E1() \ + \ + IRQ_ENTER(); \ + LOCK(A); \ + UNLOCK(A); \ + IRQ_EXIT(); + +#define E2() \ + \ + IRQ_DISABLE(); \ + LOCK(A); \ + IRQ_ENABLE(); \ + UNLOCK(A); + +/* + * Generate 24 testcases: + */ +#include "locking-selftest-spin-hardirq.h" +GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_spin) + +#include "locking-selftest-rlock-hardirq.h" +GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_rlock) + +#include "locking-selftest-wlock-hardirq.h" +GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_wlock) + +#include "locking-selftest-spin-softirq.h" +GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_spin) + +#include "locking-selftest-rlock-softirq.h" +GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_rlock) + +#include "locking-selftest-wlock-softirq.h" +GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_wlock) + +#undef E1 +#undef E2 + +/* + * Acquiring a irq-unsafe lock while holding an irq-safe-lock: + */ +#define E1() \ + \ + LOCK(A); \ + LOCK(B); \ + UNLOCK(B); \ + UNLOCK(A); \ + +#define E2() \ + \ + LOCK(B); \ + UNLOCK(B); + +#define E3() \ + \ + IRQ_ENTER(); \ + LOCK(A); \ + UNLOCK(A); \ + IRQ_EXIT(); + +/* + * Generate 36 testcases: + */ +#include "locking-selftest-spin-hardirq.h" +GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_spin) + +#include "locking-selftest-rlock-hardirq.h" +GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_rlock) + +#include "locking-selftest-wlock-hardirq.h" +GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_wlock) + +#include "locking-selftest-spin-softirq.h" +GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_spin) + +#include "locking-selftest-rlock-softirq.h" +GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_rlock) + +#include "locking-selftest-wlock-softirq.h" +GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_wlock) + +#undef E1 +#undef E2 +#undef E3 + +/* + * If a lock turns into softirq-safe, but earlier it took + * a softirq-unsafe lock: + */ + +#define E1() \ + IRQ_DISABLE(); \ + LOCK(A); \ + LOCK(B); \ + UNLOCK(B); \ + UNLOCK(A); \ + IRQ_ENABLE(); + +#define E2() \ + LOCK(B); \ + UNLOCK(B); + +#define E3() \ + IRQ_ENTER(); \ + LOCK(A); \ + UNLOCK(A); \ + IRQ_EXIT(); + +/* + * Generate 36 testcases: + */ +#include "locking-selftest-spin-hardirq.h" +GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_spin) + +#include "locking-selftest-rlock-hardirq.h" +GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_rlock) + +#include "locking-selftest-wlock-hardirq.h" +GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_wlock) + +#include "locking-selftest-spin-softirq.h" +GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_spin) + +#include "locking-selftest-rlock-softirq.h" +GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_rlock) + +#include "locking-selftest-wlock-softirq.h" +GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_wlock) + +#undef E1 +#undef E2 +#undef E3 + +/* + * read-lock / write-lock irq inversion. + * + * Deadlock scenario: + * + * CPU#1 is at #1, i.e. it has write-locked A, but has not + * taken B yet. + * + * CPU#2 is at #2, i.e. it has locked B. + * + * Hardirq hits CPU#2 at point #2 and is trying to read-lock A. + * + * The deadlock occurs because CPU#1 will spin on B, and CPU#2 + * will spin on A. + */ + +#define E1() \ + \ + IRQ_DISABLE(); \ + WL(A); \ + LOCK(B); \ + UNLOCK(B); \ + WU(A); \ + IRQ_ENABLE(); + +#define E2() \ + \ + LOCK(B); \ + UNLOCK(B); + +#define E3() \ + \ + IRQ_ENTER(); \ + RL(A); \ + RU(A); \ + IRQ_EXIT(); + +/* + * Generate 36 testcases: + */ +#include "locking-selftest-spin-hardirq.h" +GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_spin) + +#include "locking-selftest-rlock-hardirq.h" +GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_rlock) + +#include "locking-selftest-wlock-hardirq.h" +GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_wlock) + +#include "locking-selftest-spin-softirq.h" +GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_spin) + +#include "locking-selftest-rlock-softirq.h" +GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_rlock) + +#include "locking-selftest-wlock-softirq.h" +GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_wlock) + +#undef E1 +#undef E2 +#undef E3 + +/* + * read-lock / write-lock recursion that is actually safe. + */ + +#define E1() \ + \ + IRQ_DISABLE(); \ + WL(A); \ + WU(A); \ + IRQ_ENABLE(); + +#define E2() \ + \ + RL(A); \ + RU(A); \ + +#define E3() \ + \ + IRQ_ENTER(); \ + RL(A); \ + L(B); \ + U(B); \ + RU(A); \ + IRQ_EXIT(); + +/* + * Generate 12 testcases: + */ +#include "locking-selftest-hardirq.h" +GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_hard) + +#include "locking-selftest-softirq.h" +GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_soft) + +#undef E1 +#undef E2 +#undef E3 + +/* + * read-lock / write-lock recursion that is unsafe. + */ + +#define E1() \ + \ + IRQ_DISABLE(); \ + L(B); \ + WL(A); \ + WU(A); \ + U(B); \ + IRQ_ENABLE(); + +#define E2() \ + \ + RL(A); \ + RU(A); \ + +#define E3() \ + \ + IRQ_ENTER(); \ + L(B); \ + U(B); \ + IRQ_EXIT(); + +/* + * Generate 12 testcases: + */ +#include "locking-selftest-hardirq.h" +// GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_hard) + +#include "locking-selftest-softirq.h" +// GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_soft) + +#ifdef CONFIG_DEBUG_LOCK_ALLOC +# define I_SPINLOCK(x) lockdep_reset_lock(&lock_##x.dep_map) +# define I_RWLOCK(x) lockdep_reset_lock(&rwlock_##x.dep_map) +# define I_MUTEX(x) lockdep_reset_lock(&mutex_##x.dep_map) +# define I_RWSEM(x) lockdep_reset_lock(&rwsem_##x.dep_map) +#else +# define I_SPINLOCK(x) +# define I_RWLOCK(x) +# define I_MUTEX(x) +# define I_RWSEM(x) +#endif + +#define I1(x) \ + do { \ + I_SPINLOCK(x); \ + I_RWLOCK(x); \ + I_MUTEX(x); \ + I_RWSEM(x); \ + } while (0) + +#define I2(x) \ + do { \ + spin_lock_init(&lock_##x); \ + rwlock_init(&rwlock_##x); \ + mutex_init(&mutex_##x); \ + init_rwsem(&rwsem_##x); \ + } while (0) + +static void reset_locks(void) +{ + local_irq_disable(); + I1(A); I1(B); I1(C); I1(D); + I1(X1); I1(X2); I1(Y1); I1(Y2); I1(Z1); I1(Z2); + lockdep_reset(); + I2(A); I2(B); I2(C); I2(D); + init_shared_classes(); + local_irq_enable(); +} + +#undef I + +static int testcase_total; +static int testcase_successes; +static int expected_testcase_failures; +static int unexpected_testcase_failures; + +static void dotest(void (*testcase_fn)(void), int expected, int lockclass_mask) +{ + unsigned long saved_preempt_count = preempt_count(); + int expected_failure = 0; + + WARN_ON(irqs_disabled()); + + testcase_fn(); + /* + * Filter out expected failures: + */ +#ifndef CONFIG_PROVE_LOCKING + if ((lockclass_mask & LOCKTYPE_SPIN) && debug_locks != expected) + expected_failure = 1; + if ((lockclass_mask & LOCKTYPE_RWLOCK) && debug_locks != expected) + expected_failure = 1; + if ((lockclass_mask & LOCKTYPE_MUTEX) && debug_locks != expected) + expected_failure = 1; + if ((lockclass_mask & LOCKTYPE_RWSEM) && debug_locks != expected) + expected_failure = 1; +#endif + if (debug_locks != expected) { + if (expected_failure) { + expected_testcase_failures++; + printk("failed|"); + } else { + unexpected_testcase_failures++; + + printk("FAILED|"); + dump_stack(); + } + } else { + testcase_successes++; + printk(" ok |"); + } + testcase_total++; + + if (debug_locks_verbose) + printk(" lockclass mask: %x, debug_locks: %d, expected: %d\n", + lockclass_mask, debug_locks, expected); + /* + * Some tests (e.g. double-unlock) might corrupt the preemption + * count, so restore it: + */ + preempt_count() = saved_preempt_count; +#ifdef CONFIG_TRACE_IRQFLAGS + if (softirq_count()) + current->softirqs_enabled = 0; + else + current->softirqs_enabled = 1; +#endif + + reset_locks(); +} + +static inline void print_testname(const char *testname) +{ + printk("%33s:", testname); +} + +#define DO_TESTCASE_1(desc, name, nr) \ + print_testname(desc"/"#nr); \ + dotest(name##_##nr, SUCCESS, LOCKTYPE_RWLOCK); \ + printk("\n"); + +#define DO_TESTCASE_1B(desc, name, nr) \ + print_testname(desc"/"#nr); \ + dotest(name##_##nr, FAILURE, LOCKTYPE_RWLOCK); \ + printk("\n"); + +#define DO_TESTCASE_3(desc, name, nr) \ + print_testname(desc"/"#nr); \ + dotest(name##_spin_##nr, FAILURE, LOCKTYPE_SPIN); \ + dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK); \ + dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK); \ + printk("\n"); + +#define DO_TESTCASE_3RW(desc, name, nr) \ + print_testname(desc"/"#nr); \ + dotest(name##_spin_##nr, FAILURE, LOCKTYPE_SPIN|LOCKTYPE_RWLOCK);\ + dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK); \ + dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK); \ + printk("\n"); + +#define DO_TESTCASE_6(desc, name) \ + print_testname(desc); \ + dotest(name##_spin, FAILURE, LOCKTYPE_SPIN); \ + dotest(name##_wlock, FAILURE, LOCKTYPE_RWLOCK); \ + dotest(name##_rlock, FAILURE, LOCKTYPE_RWLOCK); \ + dotest(name##_mutex, FAILURE, LOCKTYPE_MUTEX); \ + dotest(name##_wsem, FAILURE, LOCKTYPE_RWSEM); \ + dotest(name##_rsem, FAILURE, LOCKTYPE_RWSEM); \ + printk("\n"); + +#define DO_TESTCASE_6_SUCCESS(desc, name) \ + print_testname(desc); \ + dotest(name##_spin, SUCCESS, LOCKTYPE_SPIN); \ + dotest(name##_wlock, SUCCESS, LOCKTYPE_RWLOCK); \ + dotest(name##_rlock, SUCCESS, LOCKTYPE_RWLOCK); \ + dotest(name##_mutex, SUCCESS, LOCKTYPE_MUTEX); \ + dotest(name##_wsem, SUCCESS, LOCKTYPE_RWSEM); \ + dotest(name##_rsem, SUCCESS, LOCKTYPE_RWSEM); \ + printk("\n"); + +/* + * 'read' variant: rlocks must not trigger. + */ +#define DO_TESTCASE_6R(desc, name) \ + print_testname(desc); \ + dotest(name##_spin, FAILURE, LOCKTYPE_SPIN); \ + dotest(name##_wlock, FAILURE, LOCKTYPE_RWLOCK); \ + dotest(name##_rlock, SUCCESS, LOCKTYPE_RWLOCK); \ + dotest(name##_mutex, FAILURE, LOCKTYPE_MUTEX); \ + dotest(name##_wsem, FAILURE, LOCKTYPE_RWSEM); \ + dotest(name##_rsem, FAILURE, LOCKTYPE_RWSEM); \ + printk("\n"); + +#define DO_TESTCASE_2I(desc, name, nr) \ + DO_TESTCASE_1("hard-"desc, name##_hard, nr); \ + DO_TESTCASE_1("soft-"desc, name##_soft, nr); + +#define DO_TESTCASE_2IB(desc, name, nr) \ + DO_TESTCASE_1B("hard-"desc, name##_hard, nr); \ + DO_TESTCASE_1B("soft-"desc, name##_soft, nr); + +#define DO_TESTCASE_6I(desc, name, nr) \ + DO_TESTCASE_3("hard-"desc, name##_hard, nr); \ + DO_TESTCASE_3("soft-"desc, name##_soft, nr); + +#define DO_TESTCASE_6IRW(desc, name, nr) \ + DO_TESTCASE_3RW("hard-"desc, name##_hard, nr); \ + DO_TESTCASE_3RW("soft-"desc, name##_soft, nr); + +#define DO_TESTCASE_2x3(desc, name) \ + DO_TESTCASE_3(desc, name, 12); \ + DO_TESTCASE_3(desc, name, 21); + +#define DO_TESTCASE_2x6(desc, name) \ + DO_TESTCASE_6I(desc, name, 12); \ + DO_TESTCASE_6I(desc, name, 21); + +#define DO_TESTCASE_6x2(desc, name) \ + DO_TESTCASE_2I(desc, name, 123); \ + DO_TESTCASE_2I(desc, name, 132); \ + DO_TESTCASE_2I(desc, name, 213); \ + DO_TESTCASE_2I(desc, name, 231); \ + DO_TESTCASE_2I(desc, name, 312); \ + DO_TESTCASE_2I(desc, name, 321); + +#define DO_TESTCASE_6x2B(desc, name) \ + DO_TESTCASE_2IB(desc, name, 123); \ + DO_TESTCASE_2IB(desc, name, 132); \ + DO_TESTCASE_2IB(desc, name, 213); \ + DO_TESTCASE_2IB(desc, name, 231); \ + DO_TESTCASE_2IB(desc, name, 312); \ + DO_TESTCASE_2IB(desc, name, 321); + +#define DO_TESTCASE_6x6(desc, name) \ + DO_TESTCASE_6I(desc, name, 123); \ + DO_TESTCASE_6I(desc, name, 132); \ + DO_TESTCASE_6I(desc, name, 213); \ + DO_TESTCASE_6I(desc, name, 231); \ + DO_TESTCASE_6I(desc, name, 312); \ + DO_TESTCASE_6I(desc, name, 321); + +#define DO_TESTCASE_6x6RW(desc, name) \ + DO_TESTCASE_6IRW(desc, name, 123); \ + DO_TESTCASE_6IRW(desc, name, 132); \ + DO_TESTCASE_6IRW(desc, name, 213); \ + DO_TESTCASE_6IRW(desc, name, 231); \ + DO_TESTCASE_6IRW(desc, name, 312); \ + DO_TESTCASE_6IRW(desc, name, 321); + + +void locking_selftest(void) +{ + /* + * Got a locking failure before the selftest ran? + */ + if (!debug_locks) { + printk("----------------------------------\n"); + printk("| Locking API testsuite disabled |\n"); + printk("----------------------------------\n"); + return; + } + + /* + * Run the testsuite: + */ + printk("------------------------\n"); + printk("| Locking API testsuite:\n"); + printk("----------------------------------------------------------------------------\n"); + printk(" | spin |wlock |rlock |mutex | wsem | rsem |\n"); + printk(" --------------------------------------------------------------------------\n"); + + init_shared_classes(); + debug_locks_silent = !debug_locks_verbose; + + DO_TESTCASE_6R("A-A deadlock", AA); + DO_TESTCASE_6R("A-B-B-A deadlock", ABBA); + DO_TESTCASE_6R("A-B-B-C-C-A deadlock", ABBCCA); + DO_TESTCASE_6R("A-B-C-A-B-C deadlock", ABCABC); + DO_TESTCASE_6R("A-B-B-C-C-D-D-A deadlock", ABBCCDDA); + DO_TESTCASE_6R("A-B-C-D-B-D-D-A deadlock", ABCDBDDA); + DO_TESTCASE_6R("A-B-C-D-B-C-D-A deadlock", ABCDBCDA); + DO_TESTCASE_6("double unlock", double_unlock); + DO_TESTCASE_6("initialize held", init_held); + DO_TESTCASE_6_SUCCESS("bad unlock order", bad_unlock_order); + + printk(" --------------------------------------------------------------------------\n"); + print_testname("recursive read-lock"); + printk(" |"); + dotest(rlock_AA1, SUCCESS, LOCKTYPE_RWLOCK); + printk(" |"); + dotest(rsem_AA1, FAILURE, LOCKTYPE_RWSEM); + printk("\n"); + + print_testname("recursive read-lock #2"); + printk(" |"); + dotest(rlock_AA1B, SUCCESS, LOCKTYPE_RWLOCK); + printk(" |"); + dotest(rsem_AA1B, FAILURE, LOCKTYPE_RWSEM); + printk("\n"); + + print_testname("mixed read-write-lock"); + printk(" |"); + dotest(rlock_AA2, FAILURE, LOCKTYPE_RWLOCK); + printk(" |"); + dotest(rsem_AA2, FAILURE, LOCKTYPE_RWSEM); + printk("\n"); + + print_testname("mixed write-read-lock"); + printk(" |"); + dotest(rlock_AA3, FAILURE, LOCKTYPE_RWLOCK); + printk(" |"); + dotest(rsem_AA3, FAILURE, LOCKTYPE_RWSEM); + printk("\n"); + + printk(" --------------------------------------------------------------------------\n"); + + /* + * irq-context testcases: + */ + DO_TESTCASE_2x6("irqs-on + irq-safe-A", irqsafe1); + DO_TESTCASE_2x3("sirq-safe-A => hirqs-on", irqsafe2A); + DO_TESTCASE_2x6("safe-A + irqs-on", irqsafe2B); + DO_TESTCASE_6x6("safe-A + unsafe-B #1", irqsafe3); + DO_TESTCASE_6x6("safe-A + unsafe-B #2", irqsafe4); + DO_TESTCASE_6x6RW("irq lock-inversion", irq_inversion); + + DO_TESTCASE_6x2("irq read-recursion", irq_read_recursion); +// DO_TESTCASE_6x2B("irq read-recursion #2", irq_read_recursion2); + + if (unexpected_testcase_failures) { + printk("-----------------------------------------------------------------\n"); + debug_locks = 0; + printk("BUG: %3d unexpected failures (out of %3d) - debugging disabled! |\n", + unexpected_testcase_failures, testcase_total); + printk("-----------------------------------------------------------------\n"); + } else if (expected_testcase_failures && testcase_successes) { + printk("--------------------------------------------------------\n"); + printk("%3d out of %3d testcases failed, as expected. |\n", + expected_testcase_failures, testcase_total); + printk("----------------------------------------------------\n"); + debug_locks = 1; + } else if (expected_testcase_failures && !testcase_successes) { + printk("--------------------------------------------------------\n"); + printk("All %3d testcases failed, as expected. |\n", + expected_testcase_failures); + printk("----------------------------------------\n"); + debug_locks = 1; + } else { + printk("-------------------------------------------------------\n"); + printk("Good, all %3d testcases passed! |\n", + testcase_successes); + printk("---------------------------------\n"); + debug_locks = 1; + } + debug_locks_silent = 0; +} Index: linux-2.6.24-rc6/lib/Kconfig.debug =================================================================== --- linux-2.6.24-rc6.orig/lib/Kconfig.debug +++ linux-2.6.24-rc6/lib/Kconfig.debug @@ -350,17 +350,6 @@ config DEBUG_SPINLOCK_SLEEP If you say Y here, various routines which may sleep will become very noisy if they are called with a spinlock held. -config DEBUG_LOCKING_API_SELFTESTS - bool "Locking API boot-time self-tests" - depends on DEBUG_KERNEL - help - Say Y here if you want the kernel to run a short self-test during - bootup. The self-test checks whether common types of locking bugs - are detected by debugging mechanisms or not. (if you disable - lock debugging then those bugs wont be detected of course.) - The following locking APIs are covered: spinlocks, rwlocks, - mutexes and rwsems. - config STACKTRACE bool depends on DEBUG_KERNEL -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/