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Date: Tue, 6 Apr 2010 13:13:57 +0800
From: 杨硕 <shanqn@...il.com>
To: linux-kernel@...r.kernel.org
Subject: in x86 architecture ,why the function atomic_sub_and_test() does not
disable the interrupt?
static inline int atomic_sub_and_test(int i, atomic_t *v)
{
unsigned char c;
asm volatile(LOCK_PREFIX "subl %2,%0; sete %1"
: "+m" (v->counter), "=qm" (c)
: "ir" (i) : "memory");
return c;
}
TIA:)
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