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authorJarek Poplawski <jarkao2@o2.pl>2007-03-22 00:11:28 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-03-22 19:39:06 -0700
commit9c35dd7f8bda1849dcb430be99325504221048df (patch)
tree0c1d8eef5af9e21bf9c552f13646710f57b97f23 /kernel
parentb43376927ab0f7b64c4fb304568ecfaea10446e2 (diff)
downloadlinux-linaro-stable-9c35dd7f8bda1849dcb430be99325504221048df.tar.gz
[PATCH] lockdep: debug_show_all_locks & debug_show_held_locks vs. debug_locks
lockdep's data shouldn't be used when debug_locks == 0 because it's not updated after this, so it's more misleading than helpful. PS: probably lockdep's current-> fields should be reset after it turns debug_locks off: so, after printing a bug report, but before return from exported functions, but there are really a lot of these possibilities (e.g. after DEBUG_LOCKS_WARN_ON), so, something could be missed. (Of course direct use of this fields isn't recommended either.) Reported-by: Folkert van Heusden <folkert@vanheusden.com> Inspired-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Jarek Poplawski <jarkao2@o2.pl> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/lockdep.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index 8dc24c92dc6d..7065a687ac54 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -2742,6 +2742,10 @@ void debug_show_all_locks(void)
int count = 10;
int unlock = 1;
+ if (unlikely(!debug_locks)) {
+ printk("INFO: lockdep is turned off.\n");
+ return;
+ }
printk("\nShowing all locks held in the system:\n");
/*
@@ -2785,6 +2789,10 @@ EXPORT_SYMBOL_GPL(debug_show_all_locks);
void debug_show_held_locks(struct task_struct *task)
{
+ if (unlikely(!debug_locks)) {
+ printk("INFO: lockdep is turned off.\n");
+ return;
+ }
lockdep_print_held_locks(task);
}