Commit 0db9ae4a authored by Andrew Morton's avatar Andrew Morton Committed by Linus Torvalds
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[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: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent c14e2cfc

include/asm-alpha/atomic.h

+2 −0
Original line number Diff line number Diff line 
#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...

include/asm-alpha/barrier.h

0 → 100644
+34 −0
Original line number Diff line number Diff line 
#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 */

include/asm-alpha/system.h

+1 −30
Original line number Diff line number Diff line
@@ -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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