[PATCH v4 0/8] Support for contiguous pte hugepages

From: Punit Agrawal
Date: Wed May 24 2017 - 07:59:39 EST


Hi,

This patchset updates the hugetlb code to fix issues arising from
contiguous pte hugepages (such as on arm64). Compared to v3, This
version addresses a build failure on arm64 by including two cleanup
patches. Other than the arm64 cleanups, the rest are generic code
changes. The remaining arm64 support based on these patches will be
posted separately. The patches are based on v4.12-rc2. Previous
related postings can be found at [0], [1], [2], and [3].

The patches fall into three categories -

* Patch 1-2 - arm64 cleanups required to greatly simplify changing
huge_pte_offset() prototype in Patch 5.

Catalin, Will - are you happy for these patches to go via mm?

* Patches 3-4 address issues with gup

* Patches 5-8 relate to passing a size argument to hugepage helpers to
disambiguate the size of the referred page. These changes are
required to enable arch code to properly handle swap entries for
contiguous pte hugepages.

The changes to huge_pte_offset() (patch 5) touch multiple
architectures but I've managed to minimise these changes for the
other affected functions - huge_pte_clear() and set_huge_pte_at().

These patches gate the enabling of contiguous hugepages support on
arm64 which has been requested for systems using !4k page granule.

Feedback welcome.

Thanks,
Punit

v3 -> v4

* Reworked huge_pte_clear() and set_huge_swap_pte_at() to use #ifndef
block pattern
* Included two arm64 hugetlb patches to address build failure
* Updated tags

v2 -> v3

* Added gup fixes

v1 -> v2

* switch huge_pte_offset() to use size instead of hstate for
consistency with the rest of the api
* Expand the series to address huge_pte_clear() and set_huge_pte_at()

RFC -> v1

* Fixed a missing conversion of huge_pte_offset() prototype to add
hstate parameter. Reported by 0-day.

[0] https://www.spinics.net/lists/arm-kernel/msg582682.html
[1] http://www.mail-archive.com/linux-kernel@xxxxxxxxxxxxxxx/msg1370686.html
[2] https://lkml.org/lkml/2017/3/30/770
[3] https://lkml.org/lkml/2017/3/23/293


Punit Agrawal (5):
mm, gup: Ensure real head page is ref-counted when using hugepages
mm/hugetlb: add size parameter to huge_pte_offset()
mm/hugetlb: Allow architectures to override huge_pte_clear()
mm/hugetlb: Introduce set_huge_swap_pte_at() helper
mm: rmap: Use correct helper when poisoning hugepages

Steve Capper (2):
arm64: hugetlb: Refactor find_num_contig
arm64: hugetlb: Remove spurious calls to huge_ptep_offset

Will Deacon (1):
mm, gup: Remove broken VM_BUG_ON_PAGE compound check for hugepages

arch/arm64/mm/hugetlbpage.c | 53 +++++++++++++++++------------------------
arch/ia64/mm/hugetlbpage.c | 4 ++--
arch/metag/mm/hugetlbpage.c | 3 ++-
arch/mips/mm/hugetlbpage.c | 3 ++-
arch/parisc/mm/hugetlbpage.c | 3 ++-
arch/powerpc/mm/hugetlbpage.c | 2 +-
arch/s390/include/asm/hugetlb.h | 2 +-
arch/s390/mm/hugetlbpage.c | 3 ++-
arch/sh/mm/hugetlbpage.c | 3 ++-
arch/sparc/mm/hugetlbpage.c | 3 ++-
arch/tile/mm/hugetlbpage.c | 3 ++-
arch/x86/mm/hugetlbpage.c | 2 +-
fs/userfaultfd.c | 7 ++++--
include/asm-generic/hugetlb.h | 4 +++-
include/linux/hugetlb.h | 13 ++++++++--
mm/gup.c | 15 +++++-------
mm/hugetlb.c | 33 +++++++++++++++----------
mm/page_vma_mapped.c | 3 ++-
mm/pagewalk.c | 3 ++-
mm/rmap.c | 7 ++++--
20 files changed, 95 insertions(+), 74 deletions(-)

--
2.11.0