forked from Minki/linux
52393ccc0a
set_wmb should not be used in the kernel because it just confuses the
code more and has no benefit. Since it is not currently used in the
kernel this patch removes it so that new code does not include it.
All archs define set_wmb(var, value) to do { var = value; wmb(); }
while(0) except ia64 and sparc which use a mb() instead. But this is
still moot since it is not used anyway.
Hasn't been tested on any archs but x86 and x86_64 (and only compiled
tested)
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
75 lines
2.0 KiB
C
75 lines
2.0 KiB
C
#ifndef __ASM_CRIS_SYSTEM_H
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#define __ASM_CRIS_SYSTEM_H
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#include <asm/arch/system.h>
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/* the switch_to macro calls resume, an asm function in entry.S which does the actual
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* task switching.
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*/
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extern struct task_struct *resume(struct task_struct *prev, struct task_struct *next, int);
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#define switch_to(prev,next,last) last = resume(prev,next, \
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(int)&((struct task_struct *)0)->thread)
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#define barrier() __asm__ __volatile__("": : :"memory")
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#define mb() barrier()
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#define rmb() mb()
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#define wmb() mb()
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#define read_barrier_depends() do { } while(0)
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#define set_mb(var, value) do { var = value; mb(); } while (0)
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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() do { } while(0)
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#endif
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#define iret()
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/*
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* disable hlt during certain critical i/o operations
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*/
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#define HAVE_DISABLE_HLT
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void disable_hlt(void);
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void enable_hlt(void);
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static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int size)
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{
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/* since Etrax doesn't have any atomic xchg instructions, we need to disable
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irq's (if enabled) and do it with move.d's */
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unsigned long flags,temp;
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local_save_flags(flags); /* save flags, including irq enable bit */
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local_irq_disable(); /* shut off irq's */
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switch (size) {
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case 1:
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*((unsigned char *)&temp) = x;
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x = *(unsigned char *)ptr;
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*(unsigned char *)ptr = *((unsigned char *)&temp);
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break;
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case 2:
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*((unsigned short *)&temp) = x;
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x = *(unsigned short *)ptr;
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*(unsigned short *)ptr = *((unsigned short *)&temp);
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break;
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case 4:
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temp = x;
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x = *(unsigned long *)ptr;
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*(unsigned long *)ptr = temp;
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break;
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}
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local_irq_restore(flags); /* restore irq enable bit */
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return x;
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}
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#define arch_align_stack(x) (x)
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void default_idle(void);
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#endif
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