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

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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 <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Catalin Marinas 2006-05-19 21:55:35 +01:00 committed by Russell King
parent ec64152fee
commit c2a4c40651
1 changed files with 6 additions and 0 deletions
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6
include/asm-arm/spinlock.h
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@ -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 */