linux-kernel - Re: [PATCH -next] bcma: main.c needs to include <linux/slab.h>

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Date:	Mon, 27 Jun 2011 13:22:12 -0400
From:	Pavel Roskin <proski@....org>
To:	Johannes Berg <johannes@...solutions.net>
CC:	Arend van Spriel <arend@...adcom.com>,
	Rafał Miłecki <zajec5@...il.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	"linux-next@...r.kernel.org" <linux-next@...r.kernel.org>,
	Linux Kernel Development <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -next] bcma: main.c needs to include <linux/slab.h>

On 06/27/2011 12:57 PM, Johannes Berg wrote:

> Yeah, good rule. Consider if you have a.h, b.h and z.c, z.c needs b.h
> but not a.h, and now b.h includes a.h ("for convenience") -- changing
> a.h would needlessly recompile z.c. Now, changing slab.h will probably
> recompile everything anyway, but still...

In my configuration after touching slab.h and recompilation:

$ find -name '*.o' -newer ../linux3/include/linux/slab.h |wc -l
1508
$ find -name '*.o' |wc -l
1928

78% object files were recompiled, 22% were no recompiled.  Careful use 
of includes does save time.

-- 
Regards,
Pavel Roskin
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