[PATCH] disable debugging version of write_lock()

We've confirmed that the debug version of write_lock() can get stuck for long
enough to cause NMI watchdog timeouts and hence a crash.

We don't know why, yet.   Disable it for now.

Also disable the similar read_lock() code.  Just in case.

Thanks to Dave Olson <olson@unixfolk.com> for reporting and testing.

Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 6 insertions, 4 deletions

diff --git a/lib/spinlock_debug.c b/lib/spinlock_debug.c
index 3d9c4dc965ed..58c577dd82e5 100644
--- a/lib/spinlock_debug.c
+++ b/lib/spinlock_debug.c
@@ -162,6 +162,7 @@ static void rwlock_bug(rwlock_t *lock, const char *msg)
 
 #define RWLOCK_BUG_ON(cond, lock, msg) if (unlikely(cond)) rwlock_bug(lock, msg)
 
+#if 0           /* __write_lock_debug() can lock up - maybe this can too? */
 static void __read_lock_debug(rwlock_t *lock)
 {
         int print_once = 1;
@@ -184,12 +185,12 @@ static void __read_lock_debug(rwlock_t *lock)
                 }
         }
 }
+#endif
 
 void _raw_read_lock(rwlock_t *lock)
 {
         RWLOCK_BUG_ON(lock->magic != RWLOCK_MAGIC, lock, "bad magic");
-        if (unlikely(!__raw_read_trylock(&lock->raw_lock)))
-                __read_lock_debug(lock);
+        __raw_read_lock(&lock->raw_lock);
 }
 
 int _raw_read_trylock(rwlock_t *lock)
@@ -235,6 +236,7 @@ static inline void debug_write_unlock(rwlock_t *lock)
         lock->owner_cpu = -1;
 }
 
+#if 0           /* This can cause lockups */
 static void __write_lock_debug(rwlock_t *lock)
 {
         int print_once = 1;
@@ -257,12 +259,12 @@ static void __write_lock_debug(rwlock_t *lock)
                 }
         }
 }
+#endif
 
 void _raw_write_lock(rwlock_t *lock)
 {
         debug_write_lock_before(lock);
-        if (unlikely(!__raw_write_trylock(&lock->raw_lock)))
-                __write_lock_debug(lock);
+        __raw_write_lock(&lock->raw_lock);
         debug_write_lock_after(lock);
 }