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

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Date:	Wed, 4 Mar 2009 23:17:23 +0900
From:	Akinobu Mita <akinobu.mita@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH] generic debug pagealloc

On Tue, Mar 03, 2009 at 01:36:10PM -0800, Andrew Morton wrote:
> Alternatively, we could just not do the kmap_atomic() at all.  i386
> won't be using this code and IIRC the only other highmem architecture
> is powerpc32, and ppc32 appears to also have its own DEBUG_PAGEALLOC
> implementation.  So you could remove the kmap_atomic() stuff and put
> 
> #ifdef CONFIG_HIGHMEM
> #error i goofed
> #endif
> 
> in there.

I'll take the variant of this. Then poison_page() will be

static void poison_page(struct page *page)
{
        void *addr;

        if (PageHighmem(page))
                return; // i goofed

       page->poison = true;
       addr = page_address(page);
       memset(addr, PAGE_POISON, PAGE_SIZE);
}
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