[PATCH] provide uniproc write_trylock()

Patch from Oleg Drokin <green@namesys.com>, Nikita Danilov <Nikita@Namesys.COM>

There is no uniprocessor definition of _raw_write_trylock(), so
write_trylock() doesn't work on UP.

diff --git a/include/linux/spinlock.h b/include/linux/spinlock.h
index a289a20a2484f8f62701476bdac388d74d2cbb89..a16b041fee5bf02253b87535f04c709c311894b6 100644 (file)
--- a/include/linux/spinlock.h
+++ b/include/linux/spinlock.h
@@ -179,6 +179,7 @@ typedef struct {
 #define _raw_read_unlock(lock) do { (void)(lock); } while(0)
 #define _raw_write_lock(lock)  do { (void)(lock); } while(0)
 #define _raw_write_unlock(lock)        do { (void)(lock); } while(0)
+#define _raw_write_trylock(lock) ({ (void)(lock); (1); })
 
 #endif /* !SMP */