linux-kernel - [patch 2/2] panic: add cpu/pid to warn_slowpath

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Message-Id: <20130508210144.268483628@asylum.americas.sgi.com>
Date:	Wed, 08 May 2013 16:01:04 -0500
From:	athorlton@....com
To:	linux-kernel@...r.kernel.org
Cc:	Jesper Nilsson <jesper.nilsson@...s.com>
Subject: [patch 2/2] panic: add cpu/pid to warn_slowpath_common in WARNING printk()s

These patches fix up issues with interspersed output from multiple
simultaneous calls to warn or dump_stack on multi-cpu systems.
References: <20130508210102.898396979@...lum.americas.sgi.com>
Content-Disposition: inline; filename=add-cpu-pid-warn.patch

This patch adds in the cpu/pid that called WARN() so that the stack
traces can be matched up with the WARNING messages.

Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Stephen Boyd <sboyd@...eaurora.org>
Cc: Vikram Mulukutla <markivx@...eaurora.org>
Cc: Rusty Russell <rusty@...tcorp.com.au>
Cc: Tejun Heo <tj@...nel.org>
Reviewed-by: Robin Holt <holt@....com>
Signed-off-by: Alex Thorlton <athorlton@....com>
---
 kernel/panic.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- linux.orig/kernel/panic.c
+++ linux/kernel/panic.c
@@ -399,8 +399,9 @@ struct slowpath_args {
 static void warn_slowpath_common(const char *file, int line, void *caller,
 				 unsigned taint, struct slowpath_args *args)
 {
-	printk(KERN_WARNING "------------[ cut here ]------------\n");
-	printk(KERN_WARNING "WARNING: at %s:%d %pS()\n", file, line, caller);
+	pr_warn("------------[ cut here ]------------\n");
+	pr_warn("WARNING: CPU: %d PID: %d at %s:%d %pS()\n",  '
+		raw_smp_processor_id(), current->pid, file, line, caller);
 
 	if (args)
 		vprintk(args->fmt, args->args);

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