0db9ae4a79
My alpha build is exploding because asm/atomic.h now needs smb_mb(), which is over in the (not included) system.h. I fear what will happen if I include system.h into atomic.h, so let's put the barriers into their own header file. Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
35 lines
734 B
C
35 lines
734 B
C
#ifndef __BARRIER_H
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#define __BARRIER_H
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#define mb() \
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__asm__ __volatile__("mb": : :"memory")
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#define rmb() \
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__asm__ __volatile__("mb": : :"memory")
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#define wmb() \
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__asm__ __volatile__("wmb": : :"memory")
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#define read_barrier_depends() \
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__asm__ __volatile__("mb": : :"memory")
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#ifdef CONFIG_SMP
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#define smp_mb() mb()
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#define smp_rmb() rmb()
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#define smp_wmb() wmb()
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#define smp_read_barrier_depends() read_barrier_depends()
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#else
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#define smp_mb() barrier()
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#define smp_rmb() barrier()
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#define smp_wmb() barrier()
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#define smp_read_barrier_depends() barrier()
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#endif
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#define set_mb(var, value) \
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do { var = value; mb(); } while (0)
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#define set_wmb(var, value) \
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do { var = value; wmb(); } while (0)
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#endif /* __BARRIER_H */
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