Re: [PATCH v2] mm/hugetlb: add more arch-defined huge_pte functions

[Gerald Schaefer]

On Fri, 15 Mar 2013 17:02:41 +0100
Michal Hocko <mhocko@xxxxxxx> wrote:

> On Thu 14-03-13 18:51:03, Gerald Schaefer wrote:
> > Commit abf09bed3c "s390/mm: implement software dirty bits"
> > introduced another difference in the pte layout vs. the pmd layout
> > on s390, thoroughly breaking the s390 support for hugetlbfs. This
> > requires replacing some more pte_xxx functions in mm/hugetlbfs.c
> > with a huge_pte_xxx version.
> > 
> > This patch introduces those huge_pte_xxx functions and their
> > generic implementation in asm-generic/hugetlb.h, which will now be
> > included on all architectures supporting hugetlbfs apart from s390.
> > This change will be a no-op for those architectures.
> > 
> > Signed-off-by: Gerald Schaefer <gerald.schaefer@xxxxxxxxxx>
> 
> yes this looks much better. I cannot talk about s390 part because I am
> not familiar with it but the rest looks good to me.
> 
> Maybe one nit, though. pte_page and pte_same do not have their
> huge_Foo counterparts.

Yes, a few pte_xxx calls remain. I left those because they still
work on s390 (and all other archs apparently). I am thinking about
a more complete cleanup, maybe eliminating the ambiguous use of pte_t
for hugetlb completely. Not sure if I can get to it before Martin
introduces the next s390 pte changes :)

Thanks,
Gerald

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