linux-kernel - Re: [patch 1/2] i386: use asm() like the other atomic operations already do.

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Date:	Wed, 15 Aug 2007 16:40:04 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	ak@...e.de (Andi Kleen)
Cc:	sebastian@...akpoint.cc, linux-kernel@...r.kernel.org, ak@...e.de
Subject: Re: [patch 1/2] i386: use asm() like the other atomic operations already do.

Andi Kleen <ak@...e.de> wrote:
>> My config with march=pentium-m and gcc (GCC) 4.1.2 (Gentoo 4.1.2):
>>   text    data     bss     dec     hex filename
>> 3434150  249176  176128 3859454  3ae3fe atomic_normal/vmlinux
>> 3435308  249176  176128 3860612  3ae884 atomic_inlineasm/vmlinux
> 
> What is the difference between atomic_normal and atomic_inlineasm? 

The inline asm stops certain optimisations from occuring.

I'm still unconvinced why we need this because nobody has
brought up any examples of kernel code that legitimately
need this.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
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