On Tue, Oct 9, 2012 at 4:58 PM, Yinghai Lu <yinghai@kernel.org> wrote:
> Get pgt_buf early from BRK, and use it to map PMD_SIZE to top at first.
> then use page from PMD_SIZE to map next blow range.
>
> alloc_low_page will use page from BRK at first, then will switch to use
> to memblock to find and reserve page for page table usage.
>
> At last we could get rid of calculation and find early pgt related code.
>
> Suggested-by: "H. Peter Anvin" <hpa@zytor.com>
> Signed-off-by: Yinghai Lu <yinghai@kernel.org>

sorry , there one typo in this patch, please use attached one instead.