[PATCH v2 0/2] fix MADV_COLLAPSE issue if THP settings are disabled

[Baolin Wang <baolin.wang@linux.alibaba.com>]

As we discussed in the previous thread [1], the MADV_COLLAPSE will ignore
the system-wide anon/shmem THP sysfs settings, which means that even though
we have disabled the anon/shmem THP configuration, MADV_COLLAPSE will still
attempt to collapse into a anon/shmem THP. This violates the rule we have
agreed upon: never means never. This patch set will address this issue.

[1] https://lore.kernel.org/all/1f00fdc3-a3a3-464b-8565-4c1b23d34f8d@linux.alibaba.com/

Changes from v1:
 - Update the commit message, per Zi.
 - Add Zi's reviewed tag. Thanks.
 - Update the shmem logic.

Baolin Wang (2):
  mm: huge_memory: disallow hugepages if the system-wide THP sysfs
    settings are disabled
  mm: shmem: disallow hugepages if the system-wide shmem THP sysfs
    settings are disabled

 include/linux/huge_mm.h | 23 +++++++++++++++++++----
 mm/huge_memory.c        |  2 +-
 mm/shmem.c              |  6 +++---
 3 files changed, 23 insertions(+), 8 deletions(-)

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2.43.5