![Peter Zijlstra](/assets/img/avatar_default.png)
Implement the new smp_mb__* ops as per the old ones. Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Chris Metcalf <cmetcalf@tilera.com> Link: http://lkml.kernel.org/n/tip-euuabnf5a3u23fy4fq8m3jcg@git.kernel.org Cc: Akinobu Mita <akinobu.mita@gmail.com> Cc: Chen Gang <gang.chen@asianux.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
96 lines
2.7 KiB
C
96 lines
2.7 KiB
C
/*
|
|
* Copyright 2011 Tilera Corporation. All Rights Reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation, version 2.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
|
|
* NON INFRINGEMENT. See the GNU General Public License for
|
|
* more details.
|
|
*/
|
|
|
|
#ifndef _ASM_TILE_BITOPS_64_H
|
|
#define _ASM_TILE_BITOPS_64_H
|
|
|
|
#include <linux/compiler.h>
|
|
#include <asm/cmpxchg.h>
|
|
|
|
/* See <asm/bitops.h> for API comments. */
|
|
|
|
static inline void set_bit(unsigned nr, volatile unsigned long *addr)
|
|
{
|
|
unsigned long mask = (1UL << (nr % BITS_PER_LONG));
|
|
__insn_fetchor((void *)(addr + nr / BITS_PER_LONG), mask);
|
|
}
|
|
|
|
static inline void clear_bit(unsigned nr, volatile unsigned long *addr)
|
|
{
|
|
unsigned long mask = (1UL << (nr % BITS_PER_LONG));
|
|
__insn_fetchand((void *)(addr + nr / BITS_PER_LONG), ~mask);
|
|
}
|
|
|
|
static inline void change_bit(unsigned nr, volatile unsigned long *addr)
|
|
{
|
|
unsigned long mask = (1UL << (nr % BITS_PER_LONG));
|
|
unsigned long guess, oldval;
|
|
addr += nr / BITS_PER_LONG;
|
|
oldval = *addr;
|
|
do {
|
|
guess = oldval;
|
|
oldval = cmpxchg(addr, guess, guess ^ mask);
|
|
} while (guess != oldval);
|
|
}
|
|
|
|
|
|
/*
|
|
* The test_and_xxx_bit() routines require a memory fence before we
|
|
* start the operation, and after the operation completes. We use
|
|
* smp_mb() before, and rely on the "!= 0" comparison, plus a compiler
|
|
* barrier(), to block until the atomic op is complete.
|
|
*/
|
|
|
|
static inline int test_and_set_bit(unsigned nr, volatile unsigned long *addr)
|
|
{
|
|
int val;
|
|
unsigned long mask = (1UL << (nr % BITS_PER_LONG));
|
|
smp_mb(); /* barrier for proper semantics */
|
|
val = (__insn_fetchor((void *)(addr + nr / BITS_PER_LONG), mask)
|
|
& mask) != 0;
|
|
barrier();
|
|
return val;
|
|
}
|
|
|
|
|
|
static inline int test_and_clear_bit(unsigned nr, volatile unsigned long *addr)
|
|
{
|
|
int val;
|
|
unsigned long mask = (1UL << (nr % BITS_PER_LONG));
|
|
smp_mb(); /* barrier for proper semantics */
|
|
val = (__insn_fetchand((void *)(addr + nr / BITS_PER_LONG), ~mask)
|
|
& mask) != 0;
|
|
barrier();
|
|
return val;
|
|
}
|
|
|
|
|
|
static inline int test_and_change_bit(unsigned nr,
|
|
volatile unsigned long *addr)
|
|
{
|
|
unsigned long mask = (1UL << (nr % BITS_PER_LONG));
|
|
unsigned long guess, oldval;
|
|
addr += nr / BITS_PER_LONG;
|
|
oldval = *addr;
|
|
do {
|
|
guess = oldval;
|
|
oldval = cmpxchg(addr, guess, guess ^ mask);
|
|
} while (guess != oldval);
|
|
return (oldval & mask) != 0;
|
|
}
|
|
|
|
#include <asm-generic/bitops/ext2-atomic-setbit.h>
|
|
|
|
#endif /* _ASM_TILE_BITOPS_64_H */
|