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DateWed, 22 Aug 2007 21:38:58 +0200
FromAndi Kleen <>
SubjectRe: 2.6.23-rc3-mm1
On Wed, Aug 22, 2007 at 11:32:11AM -0700, Andrew Morton 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'
> > > 

Why does that compiler not know __builtin_abs?

> 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.

I'll fix.

> > 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.

dwarf2 uses a magic compressing encoding for numbers that uses less bytes
for small numbers and more bytes for larger numbers. These are the base
types for this.

It's similar to fs/reiser4/dscale.h in your tree.

-Andi

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