Commit 73e991f4 authored by Cliff Wickman's avatar Cliff Wickman Committed by Ingo Molnar
Browse files

x86 atomic operations: atomic_or_long() atomic_inc_short() 



Provide atomic operations for increment of a 16-bit integer and
logical OR into a 64-bit integer.

Signed-off-by: default avatarCliff Wickman <cpw@sgi.com>
Reviewed-by: default avatarJeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 1812924b

include/asm-x86/atomic_64.h

+26 −0
Original line number Diff line number Diff line
@@ -431,6 +431,32 @@ static inline int atomic64_add_unless(atomic64_t *v, long a, long u) 
	return c != (u);

}



/**

 * atomic_inc_short - increment of a short integer

 * @v: pointer to type int

 *

 * Atomically adds 1 to @v

 * Returns the new value of @u

 */

static inline short int atomic_inc_short(short int *v)

{

	asm(LOCK_PREFIX "addw $1, %0" : "+m" (*v));

	return *v;

}



/**

 * atomic_or_long - OR of two long integers

 * @v1: pointer to type unsigned long

 * @v2: pointer to type unsigned long

 *

 * Atomically ORs @v1 and @v2

 * Returns the result of the OR

 */

static inline void atomic_or_long(unsigned long *v1, unsigned long v2)

{

	asm(LOCK_PREFIX "orq %1, %0" : "+m" (*v1) : "r" (v2));

}



#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)



/* These are x86-specific, used by some header files */