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From:   guoren@kernel.org
To:     palmerdabbelt@google.com, paul.walmsley@sifive.com,
        anup@brainfault.org, greentime.hu@sifive.com, zong.li@sifive.com,
        aou@eecs.berkeley.edu, tglx@linutronix.de, tycho@tycho.ws,
        nickhu@andestech.com
Cc:     linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
        linux-csky@vger.kernel.org, Guo Ren <guoren@linux.alibaba.com>
Subject: [PATCH V2 2/3] riscv: Fixup lockdep_assert_held with wrong param cpu_running
Date:   Sat, 27 Jun 2020 13:57:07 +0000
Message-Id: <1593266228-61125-3-git-send-email-guoren@kernel.org>
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From: Zong Li <zong.li@sifive.com>

The cpu_running is not a lock-class, it lacks the dep_map member in
completion. It causes the error as follow:

arch/riscv/kernel/smpboot.c: In function '__cpu_up':
./include/linux/lockdep.h:364:52: error: 'struct completion' has no member named 'dep_map'
  364 | #define lockdep_is_held(lock)  lock_is_held(&(lock)->dep_map)
      |                                                    ^~
./include/asm-generic/bug.h:113:25: note: in definition of macro 'WARN_ON'
  113 |  int __ret_warn_on = !!(condition);    \
      |                         ^~~~~~~~~
./include/linux/lockdep.h:390:27: note: in expansion of macro 'lockdep_is_held'
  390 |   WARN_ON(debug_locks && !lockdep_is_held(l)); \
      |                           ^~~~~~~~~~~~~~~
arch/riscv/kernel/smpboot.c:118:2: note: in expansion of macro 'lockdep_assert_held'
  118 |  lockdep_assert_held(&cpu_running);

There are a lot of archs which use cpu_running in smpboot.c (arm,
arm64, openrisc, xtensa, s390, x86, mips), but none of them try
lockdep_assert_held(&cpu_running.wait.lock). So Just remove it.

Signed-off-by: Zong Li <zong.li@sifive.com>
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
---
 arch/riscv/kernel/smpboot.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/riscv/kernel/smpboot.c b/arch/riscv/kernel/smpboot.c
index 4e99227..defc4e1 100644
--- a/arch/riscv/kernel/smpboot.c
+++ b/arch/riscv/kernel/smpboot.c
@@ -121,7 +121,6 @@ int __cpu_up(unsigned int cpu, struct task_struct *tidle)
 
 	ret = start_secondary_cpu(cpu, tidle);
 	if (!ret) {
-		lockdep_assert_held(&cpu_running);
 		wait_for_completion_timeout(&cpu_running,
 					    msecs_to_jiffies(1000));
 
-- 
2.7.4