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.

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Adrian Bunk <bunk@stusta.de>

diff --git a/lib/spinlock_debug.c b/lib/spinlock_debug.c
index d8b6bb419d49cd9fed7c6e33b7bc8c1850477f35..5cbcb806b08270496d6d62d3eb869699f744ba51 100644 (file)
--- a/lib/spinlock_debug.c
+++ b/lib/spinlock_debug.c
@@ -137,6 +137,7 @@ 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;
@@ -159,12 +160,12 @@ 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)
@@ -210,6 +211,7 @@ 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;
@@ -232,12 +234,12 @@ 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);
 }