linux-kernel - Re: 2.6.23-rc3-mm1

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Message-Id: <20070822113211.9ac85162.akpm@linux-foundation.org>
Date:	Wed, 22 Aug 2007 11:32:11 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	linux-kernel@...r.kernel.org, Jan Beulich <jbeulich@...ell.com>,
	Andi Kleen <ak@...e.de>
Subject: Re: 2.6.23-rc3-mm1

On Wed, 22 Aug 2007 11:03:48 -0700
Randy Dunlap <randy.dunlap@...cle.com> wrote:

> On Wed, 22 Aug 2007 02:06:48 -0700 Andrew Morton wrote:
> 
> > 
> > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.23-rc3/2.6.23-rc3-mm1/
> 
> allyesconfig on x86_64 says:
> 
> kernel/unwind.c:1016:31: error: undefined identifier '__builtin_labs'
> kernel/unwind.c:1232:25: error: undefined identifier '__builtin_labs'
> 

One wonders why x86_64-mm-unwinder.patch has an open-coded call to
__builtin_labs(), when include/linux/kernel.h:abs() should do a fine job.

And what's this stuff, anyway?

+typedef unsigned long uleb128_t;
+typedef   signed long sleb128_t;
+#define sleb128abs __builtin_labs

unsigned and signed little-endian 128-bit types?  Nope, they're 32-bit or
64-bit.   All very mysterious.
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