[PATCH] lockdep: Only ask for /proc/lock_stat output when available

From: Andreas Gruenbacher
Date: Tue Jul 15 2014 - 15:11:54 EST

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@xxxxxxxxx>
kernel/locking/lockdep.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
index d24e433..88d0d44 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");
printk(KERN_DEBUG "Please attach the output of /proc/lock_stat to the bug report\n");

static int save_trace(struct stack_trace *trace)

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