Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756865Ab0ANPB2 (ORCPT ); Thu, 14 Jan 2010 10:01:28 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756767Ab0ANPBS (ORCPT ); Thu, 14 Jan 2010 10:01:18 -0500 Received: from mail.windriver.com ([147.11.1.11]:47760 "EHLO mail.windriver.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756688Ab0ANPBQ (ORCPT ); Thu, 14 Jan 2010 10:01:16 -0500 From: Jason Wessel To: linux-kernel@vger.kernel.org Cc: kgdb-bugreport@lists.sourceforge.net, mingo@elte.hu, Jason Wessel Subject: [PATCH 27/40] debug_core,kdb: Allow the debug core to process a recursive debug entry Date: Thu, 14 Jan 2010 08:59:23 -0600 Message-Id: <1263481176-1897-28-git-send-email-jason.wessel@windriver.com> X-Mailer: git-send-email 1.6.3.1.9.g95405b In-Reply-To: <1263481176-1897-1-git-send-email-jason.wessel@windriver.com> References: <1263481176-1897-1-git-send-email-jason.wessel@windriver.com> X-OriginalArrivalTime: 14 Jan 2010 15:01:01.0007 (UTC) FILETIME=[62ABC5F0:01CA952A] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1236 Lines: 41 This allows kdb to debug a crash with in the kms code with a single level recursive re-entry. Signed-off-by: Jason Wessel --- kernel/debug/debug_core.c | 7 +++++++ 1 files changed, 7 insertions(+), 0 deletions(-) diff --git a/kernel/debug/debug_core.c b/kernel/debug/debug_core.c index e02c552..344e332 100644 --- a/kernel/debug/debug_core.c +++ b/kernel/debug/debug_core.c @@ -443,6 +443,10 @@ static int kgdb_reenter_check(struct kgdb_state *ks) } printk(KERN_CRIT "KGDB: re-enter exception: ALL breakpoints killed\n"); +#ifdef CONFIG_KGDB_KDB + /* Allow kdb to debug itself one level */ + return 0; +#endif dump_stack(); panic("Recursive entry to debugger"); @@ -487,6 +491,9 @@ acquirelock: smp_wmb(); atomic_set(&cpu_in_kgdb[cpu], 1); + if (exception_level == 1) + goto cpu_master_loop; + /* * CPU will loop if it is a slave or request to become a kgdb * master cpu and acquire the kgdb_active lock: -- 1.6.3.1.9.g95405b -- 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/