linux-kernel - Re: [PATCH 4/6] Implement a general log2 facility in the kernel

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Message-ID: <20060913184558.GB15563@flint.arm.linux.org.uk>
Date:	Wed, 13 Sep 2006 19:45:58 +0100
From:	Russell King <rmk+lkml@....linux.org.uk>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	David Howells <dhowells@...hat.com>,
	Matthew Wilcox <matthew@....cx>, Adrian Bunk <bunk@...sta.de>,
	Linus Torvalds <torvalds@...l.org>,
	Andrew Morton <akpm@...l.org>,
	Linux Kernel Development <linux-kernel@...r.kernel.org>,
	linux-arch@...r.kernel.org
Subject: Re: [PATCH 4/6] Implement a general log2 facility in the kernel

On Wed, Sep 13, 2006 at 08:38:59PM +0200, Geert Uytterhoeven wrote:
> On Wed, 13 Sep 2006, David Howells wrote:
> > Russell King <rmk+lkml@....linux.org.uk> wrote:
> > 
> > > Therefore, re-using "log2()" is about as bad as re-using the "strcmp()"
> > > name to implement a function which copies strings.
> > 
> > I should probably use ilog2() then which would at least be consistent with the
> > powerpc arch.
> > 
> > > t.c:2: warning: conflicting types for built-in function 'log2'
> 
> And apparently gcc < 4.0 doesn't give the warning.

Eh?  That's gcc 3.4.3 producing that warning.  It probably depends on
the target configuration.

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:  2.6 Serial core
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