From c2a4c40651e08e465d3a6130bd9f6dcc1ce21d83 Mon Sep 17 00:00:00 2001 From: Catalin Marinas Date: Fri, 19 May 2006 21:55:35 +0100 Subject: [PATCH] [ARM] 3533/1: Implement the __raw_(read|write)_can_lock functions on ARM Patch from Catalin Marinas Recent patches introduced the write_can_lock() call in the kernel/ptrace.c file. Implement the __raw_* variants on ARM (SMP) as well. Signed-off-by: Catalin Marinas Signed-off-by: Russell King --- include/asm-arm/spinlock.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/include/asm-arm/spinlock.h b/include/asm-arm/spinlock.h index 43ad4e5..406ca97 100644 --- 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 */ -- 2.7.4