[ARM] 3533/1: Implement the __raw_(read|write)_can_lock functions on ARM

[linux-2.6-omap-h63xx.git] / include / asm-arm / spinlock.h

diff --git a/include/asm-arm/spinlock.h b/include/asm-arm/spinlock.h
index 43ad4e55878c7961a535e6ce427b842adecb2372..406ca97a8ab29f99d381565ab3c9b745c1f147a3 100644 (file)
--- a/include/asm-arm/spinlock.h
+++ b/include/asm-arm/spinlock.h
@@ -142,6 +142,9 @@ static inline void __raw_write_unlock(raw_rwlock_t *rw)
        : "cc");
 }
 
+/* write_can_lock - would write_trylock() succeed? */
+#define __raw_write_can_lock(x)                ((x)->lock == 0x80000000)
+
 /*
  * Read locks are a bit more hairy:
  *  - Exclusively load the lock value.
@@ -198,4 +201,7 @@ static inline void __raw_read_unlock(raw_rwlock_t *rw)
 
 #define __raw_read_trylock(lock) generic__raw_read_trylock(lock)
 
+/* read_can_lock - would read_trylock() succeed? */
+#define __raw_read_can_lock(x)         ((x)->lock < 0x80000000)
+
 #endif /* __ASM_SPINLOCK_H */