linux-kernel - Re: [PATCH 4/4] mm: variable length argument support

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Date:	Wed, 6 Jun 2007 01:36:58 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	linux-kernel@...r.kernel.org, parisc-linux@...ts.parisc-linux.org,
	linux-mm@...ck.org, linux-arch@...r.kernel.org,
	Ollie Wild <aaw@...gle.com>, Ingo Molnar <mingo@...e.hu>,
	Andi Kleen <ak@...e.de>
Subject: Re: [PATCH 4/4] mm: variable length argument support

On Tue, 05 Jun 2007 17:05:27 +0200 Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:

> From: Ollie Wild <aaw@...gle.com>
> 
> Remove the arg+env limit of MAX_ARG_PAGES by copying the strings directly
> from the old mm into the new mm.
> 
> We create the new mm before the binfmt code runs, and place the new stack
> at the very top of the address space. Once the binfmt code runs and figures
> out where the stack should be, we move it downwards.
> 
> It is a bit peculiar in that we have one task with two mm's, one of which is
> inactive.
> 
> ...
>
> +				flush_cache_page(bprm->vma, kpos,
> +						 page_to_pfn(kmapped_page));

Breaks SuperH:

fs/exec.c: In function `bprm_mm_init':
fs/exec.c:268: warning: unused variable `vma'
fs/exec.c: In function `copy_strings':
fs/exec.c:431: error: structure has no member named `vma'

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