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disable debugging version of write_lock()

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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>
This commit is contained in:
Andrew Morton
2006-11-20 00:11:42 +01:00
committed by Adrian Bunk
parent 9e9c714703
commit de6c0ccfa9
1 changed files with 6 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/spinlock_debug.c
+6 -4
View File
@@ -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);
}