提交 0db9ae4a 编写于 作者: A Andrew Morton 提交者: Linus Torvalds

[PATCH] alpha: atomic dependency fix

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: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
上级 c14e2cfc
#ifndef _ALPHA_ATOMIC_H
#define _ALPHA_ATOMIC_H
#include <asm/barrier.h>
/*
* Atomic operations that C can't guarantee us. Useful for
* resource counting etc...
......
#ifndef __BARRIER_H
#define __BARRIER_H
#define mb() \
__asm__ __volatile__("mb": : :"memory")
#define rmb() \
__asm__ __volatile__("mb": : :"memory")
#define wmb() \
__asm__ __volatile__("wmb": : :"memory")
#define read_barrier_depends() \
__asm__ __volatile__("mb": : :"memory")
#ifdef CONFIG_SMP
#define smp_mb() mb()
#define smp_rmb() rmb()
#define smp_wmb() wmb()
#define smp_read_barrier_depends() read_barrier_depends()
#else
#define smp_mb() barrier()
#define smp_rmb() barrier()
#define smp_wmb() barrier()
#define smp_read_barrier_depends() barrier()
#endif
#define set_mb(var, value) \
do { var = value; mb(); } while (0)
#define set_wmb(var, value) \
do { var = value; wmb(); } while (0)
#endif /* __BARRIER_H */
......@@ -4,6 +4,7 @@
#include <linux/config.h>
#include <asm/pal.h>
#include <asm/page.h>
#include <asm/barrier.h>
/*
* System defines.. Note that this is included both from .c and .S
......@@ -139,36 +140,6 @@ extern void halt(void) __attribute__((noreturn));
struct task_struct;
extern struct task_struct *alpha_switch_to(unsigned long, struct task_struct*);
#define mb() \
__asm__ __volatile__("mb": : :"memory")
#define rmb() \
__asm__ __volatile__("mb": : :"memory")
#define wmb() \
__asm__ __volatile__("wmb": : :"memory")
#define read_barrier_depends() \
__asm__ __volatile__("mb": : :"memory")
#ifdef CONFIG_SMP
#define smp_mb() mb()
#define smp_rmb() rmb()
#define smp_wmb() wmb()
#define smp_read_barrier_depends() read_barrier_depends()
#else
#define smp_mb() barrier()
#define smp_rmb() barrier()
#define smp_wmb() barrier()
#define smp_read_barrier_depends() barrier()
#endif
#define set_mb(var, value) \
do { var = value; mb(); } while (0)
#define set_wmb(var, value) \
do { var = value; wmb(); } while (0)
#define imb() \
__asm__ __volatile__ ("call_pal %0 #imb" : : "i" (PAL_imb) : "memory")
......
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