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    SubjectRe: 2.6.23-rc3-mm1
    On Wed, 22 Aug 2007 21:38:58 +0200 Andi Kleen wrote:

    > 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?

    I dunno:

    > gcc --version
    gcc (GCC) 4.1.0 (SUSE Linux)


    > > 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

    ---
    ~Randy
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