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Commit 470c27e4 authored by Vineet Gupta's avatar Vineet Gupta
Browse files

arch: conditionally define smp_{mb,rmb,wmb} 



That way arches can define the minimal versions and still #include
asm-generic for defaults (vs. defining defaults in arch code)

See new barrier.h in arc for usage !

Acked-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
parent 2576c28e

include/asm-generic/barrier.h

+25 −0
Original line number Original line Diff line number Diff line
@@ -55,17 +55,42 @@ 
#endif

#endif





#ifdef CONFIG_SMP

#ifdef CONFIG_SMP



#ifndef smp_mb

#define smp_mb()	mb()

#define smp_mb()	mb()

#endif



#ifndef smp_rmb

#define smp_rmb()	rmb()

#define smp_rmb()	rmb()

#endif



#ifndef smp_wmb

#define smp_wmb()	wmb()

#define smp_wmb()	wmb()

#endif



#ifndef smp_read_barrier_depends

#define smp_read_barrier_depends()	read_barrier_depends()

#define smp_read_barrier_depends()	read_barrier_depends()

#endif



#else

#else

#ifndef smp_mb

#define smp_mb()	barrier()

#define smp_mb()	barrier()

#endif



#ifndef smp_rmb

#define smp_rmb()	barrier()

#define smp_rmb()	barrier()

#endif



#ifndef smp_wmb

#define smp_wmb()	barrier()

#define smp_wmb()	barrier()

#endif



#ifndef smp_read_barrier_depends

#define smp_read_barrier_depends()	do { } while (0)

#define smp_read_barrier_depends()	do { } while (0)

#endif

#endif





#endif



#ifndef set_mb

#ifndef set_mb

#define set_mb(var, value)  do { (var) = (value); mb(); } while (0)

#define set_mb(var, value)  do { (var) = (value); mb(); } while (0)

#endif

#endif