Re: mm/rmap.c negative page map count BUG.

[Andrew Morton]

Octavio Alvarez Piza <alvarezp@xxxxxxxxxxxxxxxx> wrote:
>
> > That means page->_mapcount contained 0xfffeffff when it should have
>  > contained 0xffffffff.  A single bit got cleared.  Probably bad memory,
>  > overheating, something of that kind.
> 
>  BTW, what's the first 8 in flags:0x80010008? I can't find 1<<31 in
>  include/linux/page-flags.h

That's the page's zone identifier.  We stuff that into the high bits of
page->flags for page_zone().
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