linux-kernel - Re: [PATCH v3] elf loader support for auxvec base platform string

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Date:	Fri, 18 Jul 2008 13:28:50 -0500
From:	Nathan Lynch <ntl@...ox.com>
To:	John Reiser <jreiser@...Wagon.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	benh@...nel.crashing.org, torvalds@...ux-foundation.org,
	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org,
	roland@...hat.com
Subject: Re: [PATCH v3] elf loader support for auxvec base platform string

John Reiser wrote:
> Andrew Morton wrote:
> > On Thu, 17 Jul 2008 17:19:32 -0500
> > Nathan Lynch <ntl@...ox.com> wrote:
> > 
> > 
> >> [snip]
> >> A new aux vector entry, AT_BASE_PLATFORM, will denote the actual hardware.
> [snip]
> 
> > OK.
> > 
> > But it conflicts directly with the already-queued
> > execve-filename-document-and-export-via-auxiliary-vector.patch

Okay, I can rebase on -mm.


> It seems to me that most of the patch conflicts are mechanical
> and could be merged mechanically.
> 
> However I believe that the documentation change to this comment is important:
> -----
> >  #ifdef __KERNEL__
> > -#define AT_VECTOR_SIZE_BASE (14 + 2) /* NEW_AUX_ENT entries in auxiliary table */
> > +#define AT_VECTOR_SIZE_BASE 17 /* NEW_AUX_ENT entries in auxiliary table */
> > +  /* number of "#define AT_.*" above, minus {AT_NULL, AT_IGNORE, AT_NOTELF} */
> >  #endif
> -----
> I scratched my head for a while to figure out that AT_NOTELF also was
> a subtraction as far as AT_VECTOR_SIZE_BASE was concerned.

John, from your patch:

+#define AT_EXECFN  31	/* filename of program */

How did you arrive at 31 for the value of AT_EXECFN?  I haven't been
able to find out how AT_* values are "allocated", or what the reason
is for the gap between AT_SECURE and AT_SYSINFO.
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