On Sun, Feb 06, 2022 at 08:46:45PM +0000, Matthew Wilcox wrote:
> On Sun, Feb 06, 2022 at 08:13:11PM +0200, Mike Rapoport wrote:
> > On Fri, Feb 04, 2022 at 07:58:18PM +0000, Matthew Wilcox (Oracle) wrote:
> > > I need to use this function in common code, so define it for hexagon.
> > >
> > > Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
> > > ---
> > > arch/hexagon/include/asm/pgtable.h | 3 ++-
> >
> > Why hexagon out of all architectures?
> > What about m68k, nios2, nds32 etc?
> Presumably they don't support CONFIG_TRANSPARENT_HUGEPAGE.
> This code isn't compiled when THP are disabled; at least I haven't
> had a buildbot complaint for any other architectures.
m68k defconfig fails:
CC mm/page_vma_mapped.o
mm/page_vma_mapped.c: In function 'page_vma_mapped_walk':
mm/page_vma_mapped.c:219:20: error: implicit declaration of function 'pmd_pfn'; did you mean 'pmd_off'? [-Werror=implicit-function-declaration]
219 | if (!check_pmd(pmd_pfn(pmde), pvmw))
| ^~~~~~~
| pmd_off
>
> > > +#define pmd_pfn(pmd) (pmd_val(pmd) >> PAGE_SHIFT)
> >
> > I'd put it in include/linux/pgtable.h inside #ifndef pmd_pfn
>
> That's completely upside down. pmd_pfn() should be defined by each
> architecture (because generic code can't know anything about the format
> of PMDs); if anything pmd_page() should be defined in linux/pgtable.h
> in terms of pmd_pfn.
>
> I'm not signing up to do that work as part of this series. That seems
> like a distraction.
--
Sincerely yours,
Mike.
