linux-kernel - in x86 architecture ,why the function atomic_sub_and

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Message-ID: <u2mffe582101004052213zb2e4ec2dp110b8177c04f300e@mail.gmail.com>
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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