[PATCH 0/8] hugepage migration fixes (v5)

[Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>]

Hi everyone,

This is ver.5 patchset for fixing hugepage migration's race problem.

In ver.4, Hugh enlighted me about the problem around pmd_huge(), where
pmd_huge() returned false for migration/hwpoison entry and we treated them
as normal pages. IOW, we didn't handle !pmd_present case properly.

So I added a new separate patch for this problem as patch 2/8, and I changed
patch "mm/hugetlb: take page table lock in follow_huge_pmd()" (3/8 in this
series) to handle non-present hugetlb case in follow_huge_pmd().

Other than that, changes in this version are minor ones like comment fix.

Can I beg your comments and reviews again?

Thanks,
Naoya Horiguchi
---
Tree: git@github.com:Naoya-Horiguchi/linux.git
Branch: mmotm-2014-11-26-15-45/fix_hugetlbfs_follow_page.v5

v2: http://thread.gmane.org/gmane.linux.kernel/1761065
v3: http://thread.gmane.org/gmane.linux.kernel/1776585
v4: http://thread.gmane.org/gmane.linux.kernel/1788215
---
Summary:

Naoya Horiguchi (8):
      mm/hugetlb: reduce arch dependent code around follow_huge_*
      mm/hugetlb: pmd_huge() returns true for non-present hugepage
      mm/hugetlb: take page table lock in follow_huge_pmd()
      mm/hugetlb: fix getting refcount 0 page in hugetlb_fault()
      mm/hugetlb: add migration/hwpoisoned entry check in hugetlb_change_protection
      mm/hugetlb: add migration entry check in __unmap_hugepage_range
      mm/hugetlb: fix suboptimal migration/hwpoisoned entry check
      mm/hugetlb: cleanup and rename is_hugetlb_entry_(migration|hwpoisoned)()

 arch/arm/mm/hugetlbpage.c     |   6 --
 arch/arm64/mm/hugetlbpage.c   |   6 --
 arch/ia64/mm/hugetlbpage.c    |   6 --
 arch/metag/mm/hugetlbpage.c   |   6 --
 arch/mips/mm/hugetlbpage.c    |  18 ----
 arch/powerpc/mm/hugetlbpage.c |   8 ++
 arch/s390/mm/hugetlbpage.c    |  20 -----
 arch/sh/mm/hugetlbpage.c      |  12 ---
 arch/sparc/mm/hugetlbpage.c   |  12 ---
 arch/tile/mm/hugetlbpage.c    |  28 ------
 arch/x86/mm/gup.c             |   2 +-
 arch/x86/mm/hugetlbpage.c     |  20 ++---
 include/linux/hugetlb.h       |   8 +-
 include/linux/swapops.h       |   4 +
 mm/gup.c                      |  25 ++----
 mm/hugetlb.c                  | 196 ++++++++++++++++++++++++++----------------
 mm/migrate.c                  |   5 +-
 17 files changed, 156 insertions(+), 226 deletions(-)
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