Hi,
On ARM64 architecture, it can support CONT-PTE/PMD size hugetlb. When
looking up hugetlb page by follow_page(), we will hold the incorrect
pte/pmd lock for the CONT-PTE/PMD size hugetlb page, which will make
the pte/pmd entry unstable even under the lock and cause some potential
race issues. So considering the CONT-PTE/PMD size hugetlb, this patch set
changes to use the correct function to get the correct pte/pmd entry lock
to make the pte/pmd entry stable.
Changes from v1:
- Introduce a new helper to handle the CONT-PTE page.
- Use finer grained locks for CONT-PTE/PMD entries.
- Update some commit message.
Baolin Wang (5):
mm/hugetlb: fix races when looking up a CONT-PTE size hugetlb page
mm/hugetlb: use PTE page lock to protect CONT-PTE entries
mm/hugetlb: fix races when looking up a CONT-PMD size hugetlb page
mm/hugetlb: use PMD page lock to protect CONT-PTE entries
mm/hugetlb: add FOLL_MIGRATION validation before waiting for a
migration entry
include/linux/hugetlb.h | 38 ++++++++++++++++++++++++---
mm/gup.c | 13 ++++++++-
mm/hugetlb.c | 70 ++++++++++++++++++++++++++++++++++++++++++++++---
3 files changed, 113 insertions(+), 8 deletions(-)
--
1.8.3.1
