[PATCH] Fix DEBUG_PAGEALLOC on 603/e300

[Benjamin Herrenschmidt]

On Mon, 2010-05-03 at 09:19 -0500, Xianghua Xiao wrote:

> Ok here is the test result I did this morning, in short with/without
> Ben's patch it will oops if you write to a freed page.

Probably lucky enough that the free_pages() is pushing the stuff out of
the TLB. At least my patch prevents writing to a non-existing hash table
though, thus avoiding memory corruption.

Cheers,
Ben.