linux-kernel - Re: 2.6.23-rc3-mm1

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 22 Aug 2007 12:17:31 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Andi Kleen <ak@...e.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Jan Beulich <jbeulich@...ell.com>
Subject: Re: 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
*** Remember to use Documentation/SubmitChecklist when testing your code ***
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/