linux-kernel - Re: [PATCH v2] x86: fix ktermios-termio conversion

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Message-ID: <20090512092601.GB29796@elte.hu>
Date:	Tue, 12 May 2009 11:26:01 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Arnd Bergmann <arnd@...db.de>, x86@...nel.org,
	linux-kernel@...r.kernel.org,
	Remis Lima Baima <remis.developer@...glemail.com>
Subject: Re: [PATCH v2] x86: fix ktermios-termio conversion


* Alan Cox <alan@...rguk.ukuu.org.uk> wrote:

> > hm, on x86 you could use get_user_try / get_user_ex() / 
> > get_user_catch() approach to linearize the dependencies and 
> > reduce register pressure.
> 
> It used *once*, in a path that is never executed except by some 
> ancient binaries. It isn't worth the effort.

i know, and i tested the patch so i know what effects it has.

I never made any argument about inlining, it's obviously correct to 
have a use-once function inline.

My argument was very simple: the patch causes +150 bytes of bloat. 
The try/ex/catch method can help reduce register pressure and can 
reducethe size of code quite visibly.

	Ingo
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