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6247958653
This patch implements the AArch64-specific atomic bitops functions using exclusive memory accesses to avoid locking. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
68 lines
2.1 KiB
C
68 lines
2.1 KiB
C
/*
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* Copyright (C) 2012 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ASM_BITOPS_H
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#define __ASM_BITOPS_H
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#include <linux/compiler.h>
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#include <asm/barrier.h>
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/*
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* clear_bit may not imply a memory barrier
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*/
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#ifndef smp_mb__before_clear_bit
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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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#endif
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#ifndef _LINUX_BITOPS_H
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#error only <linux/bitops.h> can be included directly
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#endif
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/*
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* Little endian assembly atomic bitops.
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*/
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extern void set_bit(int nr, volatile unsigned long *p);
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extern void clear_bit(int nr, volatile unsigned long *p);
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extern void change_bit(int nr, volatile unsigned long *p);
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extern int test_and_set_bit(int nr, volatile unsigned long *p);
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extern int test_and_clear_bit(int nr, volatile unsigned long *p);
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extern int test_and_change_bit(int nr, volatile unsigned long *p);
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#include <asm-generic/bitops/builtin-__ffs.h>
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#include <asm-generic/bitops/builtin-ffs.h>
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#include <asm-generic/bitops/builtin-__fls.h>
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#include <asm-generic/bitops/builtin-fls.h>
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#include <asm-generic/bitops/ffz.h>
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#include <asm-generic/bitops/fls64.h>
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#include <asm-generic/bitops/find.h>
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#include <asm-generic/bitops/sched.h>
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#include <asm-generic/bitops/hweight.h>
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#include <asm-generic/bitops/lock.h>
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#include <asm-generic/bitops/non-atomic.h>
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#include <asm-generic/bitops/le.h>
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/*
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* Ext2 is defined to use little-endian byte ordering.
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*/
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#define ext2_set_bit_atomic(lock, nr, p) test_and_set_bit_le(nr, p)
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#define ext2_clear_bit_atomic(lock, nr, p) test_and_clear_bit_le(nr, p)
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#endif /* __ASM_BITOPS_H */
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