* Matthew Wilcox <[email protected]> wrote:
> Moreover, do we want to get stack dumps while running the locking
> testsuite in the first place? From various comments, it looks like
> it's supposed to be turned off, but it looks like the sense of
> debug_locks_silent is inverted in the definition of
> DEBUG_LOCKS_WARN_ON:
>
> if (unlikely(c)) { \
> if (debug_locks_silent || debug_locks_off()) \
> WARN_ON(1); \
>
> Surely that should be:
>
> if (!debug_locks_silent && debug_locks_off())
> WARN_ON(1);
oops, indeed! Fix below.
Ingo
------------->
Subject: [patch] lock debugging: fix DEBUG_LOCKS_WARN_ON() & debug_locks_silent
From: Ingo Molnar <[email protected]>
Matthew Wilcox noticed that the debug_locks_silent use should be
inverted in DEBUG_LOCKS_WARN_ON(). This bug was causing spurious
stacktraces and incorrect failures in the locking self-test on the
parisc kernel.
Bug-found-by: Matthew Wilcox <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
---
include/linux/debug_locks.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
Index: linux/include/linux/debug_locks.h
===================================================================
--- linux.orig/include/linux/debug_locks.h
+++ linux/include/linux/debug_locks.h
@@ -24,7 +24,7 @@ extern int debug_locks_off(void);
int __ret = 0; \
\
if (unlikely(c)) { \
- if (debug_locks_silent || debug_locks_off()) \
+ if (!debug_locks_silent && debug_locks_off()) \
WARN_ON(1); \
__ret = 1; \
} \
-
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