mirror of
https://github.com/torvalds/linux.git
synced 2024-12-27 05:11:48 +00:00
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>
111 lines
2.7 KiB
C
111 lines
2.7 KiB
C
/*
|
|
* include/asm-v850/system.h -- Low-level interrupt/thread ops
|
|
*
|
|
* Copyright (C) 2001,02,03 NEC Electronics Corporation
|
|
* Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org>
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General
|
|
* Public License. See the file COPYING in the main directory of this
|
|
* archive for more details.
|
|
*
|
|
* Written by Miles Bader <miles@gnu.org>
|
|
*/
|
|
|
|
#ifndef __V850_SYSTEM_H__
|
|
#define __V850_SYSTEM_H__
|
|
|
|
#include <linux/linkage.h>
|
|
#include <asm/ptrace.h>
|
|
|
|
|
|
/*
|
|
* switch_to(n) should switch tasks to task ptr, first checking that
|
|
* ptr isn't the current task, in which case it does nothing.
|
|
*/
|
|
struct thread_struct;
|
|
extern void *switch_thread (struct thread_struct *last,
|
|
struct thread_struct *next);
|
|
#define switch_to(prev,next,last) \
|
|
do { \
|
|
if (prev != next) { \
|
|
(last) = switch_thread (&prev->thread, &next->thread); \
|
|
} \
|
|
} while (0)
|
|
|
|
|
|
/* Enable/disable interrupts. */
|
|
#define local_irq_enable() __asm__ __volatile__ ("ei")
|
|
#define local_irq_disable() __asm__ __volatile__ ("di")
|
|
|
|
#define local_save_flags(flags) \
|
|
__asm__ __volatile__ ("stsr %1, %0" : "=r" (flags) : "i" (SR_PSW))
|
|
#define local_restore_flags(flags) \
|
|
__asm__ __volatile__ ("ldsr %0, %1" :: "r" (flags), "i" (SR_PSW))
|
|
|
|
/* For spinlocks etc */
|
|
#define local_irq_save(flags) \
|
|
do { local_save_flags (flags); local_irq_disable (); } while (0)
|
|
#define local_irq_restore(flags) \
|
|
local_restore_flags (flags);
|
|
|
|
|
|
static inline int irqs_disabled (void)
|
|
{
|
|
unsigned flags;
|
|
local_save_flags (flags);
|
|
return !!(flags & 0x20);
|
|
}
|
|
|
|
|
|
/*
|
|
* Force strict CPU ordering.
|
|
* Not really required on v850...
|
|
*/
|
|
#define nop() __asm__ __volatile__ ("nop")
|
|
#define mb() __asm__ __volatile__ ("" ::: "memory")
|
|
#define rmb() mb ()
|
|
#define wmb() mb ()
|
|
#define read_barrier_depends() ((void)0)
|
|
#define set_rmb(var, value) do { xchg (&var, value); } while (0)
|
|
#define set_mb(var, value) set_rmb (var, value)
|
|
|
|
#define smp_mb() mb ()
|
|
#define smp_rmb() rmb ()
|
|
#define smp_wmb() wmb ()
|
|
#define smp_read_barrier_depends() read_barrier_depends()
|
|
|
|
#define xchg(ptr, with) \
|
|
((__typeof__ (*(ptr)))__xchg ((unsigned long)(with), (ptr), sizeof (*(ptr))))
|
|
#define tas(ptr) (xchg ((ptr), 1))
|
|
|
|
static inline unsigned long __xchg (unsigned long with,
|
|
__volatile__ void *ptr, int size)
|
|
{
|
|
unsigned long tmp, flags;
|
|
|
|
local_irq_save (flags);
|
|
|
|
switch (size) {
|
|
case 1:
|
|
tmp = *(unsigned char *)ptr;
|
|
*(unsigned char *)ptr = with;
|
|
break;
|
|
case 2:
|
|
tmp = *(unsigned short *)ptr;
|
|
*(unsigned short *)ptr = with;
|
|
break;
|
|
case 4:
|
|
tmp = *(unsigned long *)ptr;
|
|
*(unsigned long *)ptr = with;
|
|
break;
|
|
}
|
|
|
|
local_irq_restore (flags);
|
|
|
|
return tmp;
|
|
}
|
|
|
|
#define arch_align_stack(x) (x)
|
|
|
|
#endif /* __V850_SYSTEM_H__ */
|