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Subject: Bitops source problem
Date: Thu, 17 Jan 2008 10:39:06 +0530
Message-ID: <1145971D427D7F43B0DBDAE22221C4B5035FDDAC@nipns00a210.FPS.NIHILENT.COM>
Thread-Topic: 2.6.24-rc8-rt1
Thread-Index: AchYwWhwLulcdn+qRUGOOkQuE9GqHgAA77/g
From: "Pravin Nanaware" <p.nanaware@nihilent.com>
To: "LKML" <linux-kernel@vger.kernel.org>
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1634
Lines: 38

Hi,

I was just going through the include file in the /usr/include/asm/bitops.h

The function description describes it as non-atomic but it seems it is not. 

static __inline__ void __change_bit(int nr, volatile void * addr)
{
        __asm__ __volatile__(
                "btcl %1,%0"
                :"=m" (ADDR)
                :"Ir" (nr));
}

The kernel version I am using is 2.6.9-42. Is it right or am I missing something ?  

Thanks,
Pravin

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