From: Matti Linnanvuori <[email protected]>
include/linux/mutex.h file is unclear about software interrupts and the return value of mutex_trylock.
Signed-off-by: Matti Linnanvuori <[email protected]>
---
--- linux-2.6.23-rc6/include/linux/mutex.h 2007-09-09 09:55:34.917468000 +0300
+++ linux-2.6.23/include/linux/mutex.h 2007-09-15 11:49:28.353291500 +0300
@@ -29,7 +29,8 @@
* - task may not exit with mutex held
* - memory areas where held locks reside must not be freed
* - held mutexes must not be reinitialized
- * - mutexes may not be used in irq contexts
+ * - mutexes may not be used in hardware or software interrupt
+ * contexts such as tasklets and timers
*
* These semantics are fully enforced when DEBUG_MUTEXES is
* enabled. Furthermore, besides enforcing the above rules, the mutex
@@ -133,6 +134,7 @@ extern int __must_check mutex_lock_inter
#endif
/*
+ * mutex_trylock returns nonzero on success or 0 on failure to lock.
* NOTE: mutex_trylock() follows the spin_trylock() convention,
* not the down_trylock() convention!
*/
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