[SPARC64]: Implement __raw_read_trylock()
generic__raw_read_trylock() just does a raw_read_lock() so that isn't very useful. Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -131,6 +131,28 @@ static void inline __read_lock(raw_rwlock_t *lock)
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: "memory");
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}
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static int inline __read_trylock(raw_rwlock_t *lock)
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{
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int tmp1, tmp2;
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__asm__ __volatile__ (
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"1: ldsw [%2], %0\n"
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" brlz,a,pn %0, 2f\n"
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" mov 0, %0\n"
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" add %0, 1, %1\n"
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" cas [%2], %0, %1\n"
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" cmp %0, %1\n"
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" membar #StoreLoad | #StoreStore\n"
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" bne,pn %%icc, 1b\n"
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" mov 1, %0\n"
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"2:"
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: "=&r" (tmp1), "=&r" (tmp2)
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: "r" (lock)
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: "memory");
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return tmp1;
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}
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static void inline __read_unlock(raw_rwlock_t *lock)
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{
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unsigned long tmp1, tmp2;
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@ -211,12 +233,12 @@ static int inline __write_trylock(raw_rwlock_t *lock)
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}
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#define __raw_read_lock(p) __read_lock(p)
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#define __raw_read_trylock(p) __read_trylock(p)
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#define __raw_read_unlock(p) __read_unlock(p)
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#define __raw_write_lock(p) __write_lock(p)
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#define __raw_write_unlock(p) __write_unlock(p)
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#define __raw_write_trylock(p) __write_trylock(p)
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#define __raw_read_trylock(lock) generic__raw_read_trylock(lock)
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#define __raw_read_can_lock(rw) (!((rw)->lock & 0x80000000UL))
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#define __raw_write_can_lock(rw) (!(rw)->lock)
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