linux-kernel - Re: [Patch] Always include <linux/types.h>

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Message-ID: <je7i7ilzsb.fsf@sykes.suse.de>
Date:	Wed, 05 Nov 2008 20:48:36 +0100
From:	Andreas Schwab <schwab@...e.de>
To:	Jörn Engel <joern@...fs.org>
Cc:	Alexey Dobriyan <adobriyan@...il.com>,
	Sam Ravnborg <sam@...nborg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [Patch] Always include <linux/types.h>

Jörn Engel <joern@...fs.org> writes:

> My hope was actually to speed up compilation.  If the average c file
> includes 10 headers, on types.h will get included by most of them,
> possibly multiple times.  Each run after the first still has to parse
> the whole file, just to drop everything between  #ifndef _LINUX_TYPES_H
> and #endif.

Actually GCC is smart enought to note the bracketing and avoid even
looking at it a second time.

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@...e.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
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