From 2ee91f197c0bc654b24eed5831fd12aa0d566a7d Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Wed, 6 Dec 2006 20:39:32 -0800 Subject: [PATCH] [PATCH] lockdep: show more details about self-test failures Make the locking self-test failures (of 'FAILURE' type) easier to debug by printing more information. Signed-off-by: Ingo Molnar Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/debug_locks.h | 2 +- kernel/mutex-debug.c | 3 +++ lib/locking-selftest.c | 2 ++ 3 files changed, 6 insertions(+), 1 deletion(-) diff --git a/include/linux/debug_locks.h b/include/linux/debug_locks.h index 952bee79a8f3..a1c10b0c4cf0 100644 --- a/include/linux/debug_locks.h +++ b/include/linux/debug_locks.h @@ -24,7 +24,7 @@ extern int debug_locks_off(void); int __ret = 0; \ \ if (unlikely(c)) { \ - if (debug_locks_off()) \ + if (debug_locks_silent || debug_locks_off()) \ WARN_ON(1); \ __ret = 1; \ } \ diff --git a/kernel/mutex-debug.c b/kernel/mutex-debug.c index 18651641a7b5..841539d72c55 100644 --- a/kernel/mutex-debug.c +++ b/kernel/mutex-debug.c @@ -77,6 +77,9 @@ void mutex_remove_waiter(struct mutex *lock, struct mutex_waiter *waiter, void debug_mutex_unlock(struct mutex *lock) { + if (unlikely(!debug_locks)) + return; + DEBUG_LOCKS_WARN_ON(lock->owner != current_thread_info()); DEBUG_LOCKS_WARN_ON(lock->magic != lock); DEBUG_LOCKS_WARN_ON(!lock->wait_list.prev && !lock->wait_list.next); diff --git a/lib/locking-selftest.c b/lib/locking-selftest.c index 7945787f439a..280332c1827c 100644 --- a/lib/locking-selftest.c +++ b/lib/locking-selftest.c @@ -963,7 +963,9 @@ static void dotest(void (*testcase_fn)(void), int expected, int lockclass_mask) printk("failed|"); } else { unexpected_testcase_failures++; + printk("FAILED|"); + dump_stack(); } } else { testcase_successes++;