Re: [PATCH] thp: fix huge zero page logic for page with pfn == 0

[Andrea Arcangeli]

On Wed, Apr 17, 2013 at 06:07:33PM +0300, Kirill A. Shutemov wrote:
> From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
> 
> Current implementation of huge zero page uses pfn value 0 to indicate
> that the page hasn't allocated yet. It assumes that buddy page allocator
> can't return page with pfn == 0.
> 
> Let's rework the code to store 'struct page *' of huge zero page, not
> its pfn. This way we can avoid the weak assumption.
> 
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
> Reported-by: Minchan Kim <minchan@xxxxxxxxxx>
> Acked-by: Minchan Kim <minchan@xxxxxxxxxx>
> ---
>  mm/huge_memory.c |   43 +++++++++++++++++++++----------------------
>  1 file changed, 21 insertions(+), 22 deletions(-)

Reviewed-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
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