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

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Date:	Mon, 9 Oct 2006 15:09:34 +0200 (CEST)
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
cc:	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 Mon, 9 Oct 2006, Jan Engelhardt wrote:
> >> > > > Were you planning on porting Linux to a machine with
> >> > > > non-8-bit-bytes any
> >> > > > time soon?  Because there's a lot more to fix than this.
> >> > > 
> >> > > I am considering the case [assuming 8-bit-byte machines] where
> >> > > sizeof(u32) is not 4. Though I suppose GCC will probably make a
> >> > > 32-bit
> >> > > type up if the hardware does not know one.
> >> > 
> >> > If the machine has 8-bit bytes, how can sizeof(u32) be anything other
> >> > than 4?
> >> 
> >> typedef unsigned int u32;
> >> 
> >> Though this should not be seen in the linux kernel.
> >
> > Well, uhh, actually...
> >
> > All presently-supported architectures do exactly that.  Well, some do:
> >
> > typedef unsigned int __u32;
> > #ifdef __KERNEL__
> > typedef __u32 u32;
> > #endif
> 
> 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

?

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds
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