664c100bce
Fix some signedness and variable usage warnings in change_bit() and test_and_change_bit(). Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
101 lines
2.8 KiB
C
101 lines
2.8 KiB
C
/*
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* Copyright 2011 Tilera Corporation. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for
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* more details.
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*/
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#ifndef _ASM_TILE_BITOPS_64_H
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#define _ASM_TILE_BITOPS_64_H
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#include <linux/compiler.h>
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#include <linux/atomic.h>
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/* See <asm/bitops.h> for API comments. */
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static inline void set_bit(unsigned nr, volatile unsigned long *addr)
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{
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unsigned long mask = (1UL << (nr % BITS_PER_LONG));
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__insn_fetchor((void *)(addr + nr / BITS_PER_LONG), mask);
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}
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static inline void clear_bit(unsigned nr, volatile unsigned long *addr)
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{
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unsigned long mask = (1UL << (nr % BITS_PER_LONG));
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__insn_fetchand((void *)(addr + nr / BITS_PER_LONG), ~mask);
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}
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#define smp_mb__before_clear_bit() smp_mb()
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#define smp_mb__after_clear_bit() smp_mb()
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static inline void change_bit(unsigned nr, volatile unsigned long *addr)
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{
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unsigned long mask = (1UL << (nr % BITS_PER_LONG));
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unsigned long guess, oldval;
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addr += nr / BITS_PER_LONG;
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oldval = *addr;
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do {
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guess = oldval;
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oldval = atomic64_cmpxchg((atomic64_t *)addr,
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guess, guess ^ mask);
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} while (guess != oldval);
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}
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/*
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* The test_and_xxx_bit() routines require a memory fence before we
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* start the operation, and after the operation completes. We use
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* smp_mb() before, and rely on the "!= 0" comparison, plus a compiler
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* barrier(), to block until the atomic op is complete.
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*/
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static inline int test_and_set_bit(unsigned nr, volatile unsigned long *addr)
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{
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int val;
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unsigned long mask = (1UL << (nr % BITS_PER_LONG));
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smp_mb(); /* barrier for proper semantics */
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val = (__insn_fetchor((void *)(addr + nr / BITS_PER_LONG), mask)
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& mask) != 0;
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barrier();
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return val;
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}
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static inline int test_and_clear_bit(unsigned nr, volatile unsigned long *addr)
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{
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int val;
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unsigned long mask = (1UL << (nr % BITS_PER_LONG));
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smp_mb(); /* barrier for proper semantics */
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val = (__insn_fetchand((void *)(addr + nr / BITS_PER_LONG), ~mask)
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& mask) != 0;
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barrier();
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return val;
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}
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static inline int test_and_change_bit(unsigned nr,
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volatile unsigned long *addr)
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{
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unsigned long mask = (1UL << (nr % BITS_PER_LONG));
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unsigned long guess, oldval;
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addr += nr / BITS_PER_LONG;
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oldval = *addr;
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do {
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guess = oldval;
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oldval = atomic64_cmpxchg((atomic64_t *)addr,
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guess, guess ^ mask);
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} while (guess != oldval);
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return (oldval & mask) != 0;
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}
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#include <asm-generic/bitops/ext2-atomic-setbit.h>
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#endif /* _ASM_TILE_BITOPS_64_H */
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