Re: [PATCH] mm: replace FAULT_FLAG_SIZE with parameter to huge_fault

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On Fri, Feb 03, 2017 at 02:31:22PM -0700, Dave Jiang wrote:
> Since the introduction of FAULT_FLAG_SIZE to the vm_fault flag, it has
> been somewhat painful with getting the flags set and removed at the
> correct locations. More than one kernel oops was introduced due to
> difficulties of getting the placement correctly. Removing the flag
> values and introducing an input parameter to huge_fault that indicates
> the size of the page entry. This makes the code easier to trace and
> should avoid the issues we see with the fault flags where removal of the
> flag was necessary in the fallback paths.

Why is this not in struct vm_fault?  Also can be use this opportunity
to fold ->huge_fault into ->fault?
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