Daisuke Nishimura said:
> On Tue, 18 Nov 2008 12:48:52 +0000 (GMT)
> Hugh Dickins <hugh@veritas.com> wrote:
>> That's a lot of files which you may not wish to update to get working
>> right now: I think page_cgroup.c can _probably_ reuse KM_PTE1 as a
>> temporary measure, but please verify that's safe first.
>>
> Thank you for your comment.
>
> Hmm, shmem_map_and_free_swp might unmap dir anyway and caller
> (shmem_trancate_range) handles the case, but I do agree it's
> not good manner to unmap other people's kmaps.
>
Hmm...Sorry for my original implementation.
Okay, how about this direction ?
 1. at first, remove kmap_atomic from page_cgroup.c and use GFP_KERNEL
    to allocate buffer.
 2. later, add kmap_atomic + HighMem buffer support in explicit style.
    maybe KM_BOUNCE_READ...can be used.....

patch for BUGFIX is attached.
(Sorry, I have to use Web-Mail and can't make it inlined)

Sorry,
-Kame