forked from luck/tmp_suning_uos_patched
148817ba09
The majority of architectures implement ext2 atomic bitops as
test_and_{set,clear}_bit() without spinlock.
This adds this type of generic implementation in ext2-atomic-setbit.h and
use it wherever possible.
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Suggested-by: Andreas Dilger <adilger@dilger.ca>
Suggested-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
27 lines
561 B
C
27 lines
561 B
C
#ifndef _ASM_GENERIC_BITOPS_EXT2_ATOMIC_H_
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#define _ASM_GENERIC_BITOPS_EXT2_ATOMIC_H_
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/*
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* Spinlock based version of ext2 atomic bitops
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*/
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#define ext2_set_bit_atomic(lock, nr, addr) \
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({ \
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int ret; \
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spin_lock(lock); \
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ret = __test_and_set_bit_le(nr, addr); \
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spin_unlock(lock); \
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ret; \
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})
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#define ext2_clear_bit_atomic(lock, nr, addr) \
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({ \
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int ret; \
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spin_lock(lock); \
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ret = __test_and_clear_bit_le(nr, addr); \
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spin_unlock(lock); \
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ret; \
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})
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#endif /* _ASM_GENERIC_BITOPS_EXT2_ATOMIC_H_ */
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