From acf59377267b5a74818e76873d0670b0ca6cf2fe Mon Sep 17 00:00:00 2001
From: Andreas Gruenbacher <andreas.gruenbacher@gmail.com>
Date: Tue, 15 Jul 2014 21:10:52 +0200
Subject: [PATCH] locking/lockdep: Only ask for /proc/lock_stat output when
available
When lockdep turns itself off, the following message is logged:
Please attach the output of /proc/lock_stat to the bug report
Omit this message when CONFIG_LOCK_STAT is off, and /proc/lock_stat
doesn't exist.
Signed-off-by: Andreas Gruenbacher <andreas.gruenbacher@gmail.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/1405451452-3824-1-git-send-email-andreas.gruenbacher@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
kernel/locking/lockdep.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
index d24e4339b46d..88d0d4420ad2 100644
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -384,7 +384,9 @@ static void print_lockdep_off(const char *bug_msg)
{
printk(KERN_DEBUG "%s\n", bug_msg);
printk(KERN_DEBUG "turning off the locking correctness validator.\n");
+#ifdef CONFIG_LOCK_STAT
printk(KERN_DEBUG "Please attach the output of /proc/lock_stat to the bug report\n");
+#endif
}
static int save_trace(struct stack_trace *trace)