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Commit d3ed309a authored by David S. Miller's avatar David S. Miller
Browse files

[SPARC64]: Implement __raw_read_trylock() 



generic__raw_read_trylock() just does a raw_read_lock() so that
isn't very useful.

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 44158637

include/asm-sparc64/spinlock.h

+23 −1
Original line number Diff line number Diff line
@@ -131,6 +131,28 @@ static void inline __read_lock(raw_rwlock_t *lock) 
	: "memory");

}



static int inline __read_trylock(raw_rwlock_t *lock)

{

	int tmp1, tmp2;



	__asm__ __volatile__ (

"1:	ldsw		[%2], %0\n"

"	brlz,a,pn	%0, 2f\n"

"	 mov		0, %0\n"

"	add		%0, 1, %1\n"

"	cas		[%2], %0, %1\n"

"	cmp		%0, %1\n"

"	membar		#StoreLoad | #StoreStore\n"

"	bne,pn		%%icc, 1b\n"

"	 mov		1, %0\n"

"2:"

	: "=&r" (tmp1), "=&r" (tmp2)

	: "r" (lock)

	: "memory");



	return tmp1;

}



static void inline __read_unlock(raw_rwlock_t *lock)

{

	unsigned long tmp1, tmp2;
@@ -211,12 +233,12 @@ static int inline __write_trylock(raw_rwlock_t *lock) 
}



#define __raw_read_lock(p)	__read_lock(p)

#define __raw_read_trylock(p)	__read_trylock(p)

#define __raw_read_unlock(p)	__read_unlock(p)

#define __raw_write_lock(p)	__write_lock(p)

#define __raw_write_unlock(p)	__write_unlock(p)

#define __raw_write_trylock(p)	__write_trylock(p)



#define __raw_read_trylock(lock)	generic__raw_read_trylock(lock)

#define __raw_read_can_lock(rw)		(!((rw)->lock & 0x80000000UL))

#define __raw_write_can_lock(rw)	(!(rw)->lock)