On 04/21/2017 02:17 AM, Zi Yan wrote:

From: Naoya Horiguchi <redacted>

pmd_present() checks _PAGE_PSE along with _PAGE_PRESENT to avoid
false negative return when it races with thp spilt
(during which _PAGE_PRESENT is temporary cleared.) I don't think that
dropping _PAGE_PSE check in pmd_present() works well because it can
hurt optimization of tlb handling in thp split.
In the current kernel, bits 1-4 are not used in non-present format
since commit 00839ee3b299 ("x86/mm: Move swap offset/type up in PTE to
work around erratum"). So let's move _PAGE_SWP_SOFT_DIRTY to bit 1.
Bit 7 is used as reserved (always clear), so please don't use it for
other purpose.

Signed-off-by: Naoya Horiguchi <redacted>
Signed-off-by: Zi Yan <redacted>

+Dave Hansen
+Andi Kleen

Dave/Andi/Kiril,

Does this change looks okay ? Its been on the list for some time
now. Could you please have a look into this and lets us know your
inputs/suggestions/comments ? Thank you.

- Anshuman

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