[PATCH] Tight check of pfn_valid on sparsemem - v4
minchan.kim at gmail.com
Mon Jul 26 18:47:26 EDT 2010
On Tue, Jul 27, 2010 at 1:40 AM, Christoph Lameter
<cl at linux-foundation.org> wrote:
> On Tue, 27 Jul 2010, Minchan Kim wrote:
>> This patch registers address of mem_section to memmap itself's page struct's
>> pg->private field. This means the page is used for memmap of the section.
>> Otherwise, the page is used for other purpose and memmap has a hole.
> What if page->private just happens to be the value of the page struct?
> Even if that is not possible today, someday someone may add new
> functionality to the kernel where page->pivage == page is used for some
> Checking for PG_reserved wont work?
Okay. It would be better to consider page point itself with PG_reserved.
I will reflect your opinion next version. :)
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