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x86: Implement atomic[64]_dec_if_positive()

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Add support for atomic_dec_if_positive(), and
atomic64_dec_if_positive() for x86-64.

atomic64_dec_if_positive() for x86-32 was already implemented in a previous patch.

Signed-off-by: Luca Barbieri <luca@luca-barbieri.com>
LKML-Reference: <1267183361-20775-2-git-send-email-luca@luca-barbieri.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Luca Barbieri
2010-02-26 12:22:41 +01:00
committed by H. Peter Anvin
parent 8f4f202b33
commit d7f6de1e9c
3 changed files with 47 additions and 1 deletions
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2
lib/atomic64_test.c
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@ -112,7 +112,7 @@ static __init int test_atomic64(void)
r += one;
BUG_ON(v.counter != r);
#if defined(CONFIG_X86_32) || defined(CONFIG_MIPS) || defined(CONFIG_PPC) || defined(_ASM_GENERIC_ATOMIC64_H)
#if defined(CONFIG_X86) || defined(CONFIG_MIPS) || defined(CONFIG_PPC) || defined(_ASM_GENERIC_ATOMIC64_H)
INIT(onestwos);
BUG_ON(atomic64_dec_if_positive(&v) != (onestwos - 1));
r -= one;