linux-kernel - Re: [PATCH 1/4] LOG2: Implement a general integer log2 facility in the kernel [try #4]

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Message-Id: <200610091727.34780.arnd.bergmann@de.ibm.com>
Date:	Mon, 9 Oct 2006 17:27:32 +0200
From:	Arnd Bergmann <arnd.bergmann@...ibm.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Jan Engelhardt <jengelh@...ux01.gwdg.de>,
	Kyle Moffett <mrmacman_g4@....com>,
	David Howells <dhowells@...hat.com>,
	Matthew Wilcox <matthew@....cx>,
	Linus Torvalds <torvalds@...l.org>,
	Andrew Morton <akpm@...l.org>, sfr@...b.auug.org.au,
	Linux Kernel Development <linux-kernel@...r.kernel.org>,
	linux-arch@...r.kernel.org
Subject: Re: [PATCH 1/4] LOG2: Implement a general integer log2 facility in the kernel [try #4]

On Monday 09 October 2006 17:05, Geert Uytterhoeven wrote:
> 
> On Mon, 9 Oct 2006, Arnd Bergmann wrote:
> > On Monday 09 October 2006 15:09, Geert Uytterhoeven wrote:
> > > On Mon, 9 Oct 2006, Jan Engelhardt wrote:
> > > > 
> > > > Ouch ouch ouch. It should better be
> > > > 
> > > > typedef uint32_t __u32;
> > > 
> > > You mean
> > > 
> > > #ifdef __KERNEL__
> > > typedef __u32 u32;
> > > #else
> > > // Assumed we did #include <stdint.h> before
> > > typedef uint32_t __u32;
> > > #endif
> > 
> > Why should that be a valid assumption? Right now, it works
> > if you don't include stdint.h in advance.
> 
> According to C99 section 7.18 you need to include <stdint.h> first.

Sorry, I need to rephrase: you can include <linux/types.h> without
including <stdint.h> first, and many people do that.
Relying on uint32_t would mean we break existing source.

	Arnd <><
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