Re: 2.6.15-rc1-mm2 -- Bad page state at free_hot_cold_page (in process 'aplay', page c18eef30)

[Russell King <rmk+lkml@arm.linux.org.uk>]

On Mon, Nov 21, 2005 at 03:46:50PM +0000, Hugh Dickins wrote:
> So another of my patches in -rc1-mm2 made the PageCompound technique
> available always, no longer under #ifdef CONFIG_HUGETLB_PAGE: so that
> get_page and put_page on the later constituents of the high-order
> page get redirected to the first one, and it should work okay again.
> 
> Except that I'd missed that you actually have to choose to have your
> high-order pages supplied as compound pages, by passing __GFP_COMP.
> Since I wasn't passing that, they still weren't allocated as compound
> pages, so were still being freed too soon - and the PG_reserved flag
> found while freeing gave rise to the "Bad page state" messages seen.

Does this mean that in arch/arm/mm/consistent.c, we should also set
__GFP_COMP ?  Should we be doing that today?

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:  2.6 Serial core
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