Re: [PATCH 2/2] mm: always enable thp for dax mappings

[Ross Zwisler <ross.zwisler@linux.intel.com>]

On Mon, Jun 12, 2017 at 07:47:19AM -0700, Dan Williams wrote:
> On Mon, Jun 12, 2017 at 5:07 AM, Kirill A. Shutemov
> <kirill.shutemov@linux.intel.com> wrote:
> > On Sat, Jun 10, 2017 at 02:49:37PM -0700, Dan Williams wrote:
> >> diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
> >> index c4706e2c3358..901ed3767d1b 100644
> >> --- a/include/linux/huge_mm.h
> >> +++ b/include/linux/huge_mm.h
> >> @@ -1,6 +1,8 @@
> >>  #ifndef _LINUX_HUGE_MM_H
> >>  #define _LINUX_HUGE_MM_H
> >>
> >> +#include <linux/fs.h>
> >> +
> >
> > It means <linux/mm.h> now depends on <linux/fs.h>. I don't think it's a
> > good idea.
> 
> Seems to be ok as far as 0day-kbuild-robot is concerned. The
> alternative is to move vma_is_dax() out of line. I think
> transparent_hugepage_enabled() is called frequently enough to make it
> worth it to keep it inline.

Yea, I played with moving vma_is_dax() to include/linux/mm.h instead, but ran
into the issue where IS_DAX() is defined in include/linux/fs.h.  So, any way
we slice it we end up requiring both MM and FS includes for this to work.

Since the way you have it here apparently works and passes zero-day, my vote
is to just go with it.

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