linux-kernel - Re: [PATCH] generic debug pagealloc

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Message-ID: <20090303160503.GA6538@elte.hu>
Date:	Tue, 3 Mar 2009 17:05:03 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Akinobu Mita <akinobu.mita@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-mm@...ck.org, akpm@...ux-foundation.org
Subject: Re: [PATCH] generic debug pagealloc


* Akinobu Mita <akinobu.mita@...il.com> wrote:

> CONFIG_DEBUG_PAGEALLOC is now supported by x86, powerpc, sparc 
> (64bit), and s390. This patch implements it for the rest of 
> the architectures by filling the pages with poison byte 
> patterns after free_pages() and verifying the poison patterns 
> before alloc_pages().
> 
> This generic one cannot detect invalid read accesses and it 
> can only detect invalid write accesses after a long delay. But 
> it is an feasible way for nommu architectures.

if every architecture supports it now then i guess this config 
switch can go away:

> +config ARCH_SUPPORTS_DEBUG_PAGEALLOC
> +	def_bool y

	Ingo
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