We can upgrade pte access (R -> RW transition) via mprotect. We need
to make sure we follow the recommended pte update sequence as outlined in
commit: bd5050e38aec ("powerpc/mm/radix: Change pte relax sequence to handle nest MMU hang")
for such updates. This patch series do that.
Changes from V1:
* Restrict ths only for R->RW upgrade. We don't need to do this for Autonuma
* Restrict this only for radix translation mode.
Aneesh Kumar K.V (5):
mm: Update ptep_modify_prot_start/commit to take vm_area_struct as arg
mm: update ptep_modify_prot_commit to take old pte value as arg
arch/powerpc/mm: Nest MMU workaround for mprotect RW upgrade.
mm/hugetlb: Add prot_modify_start/commit sequence for hugetlb update
arch/powerpc/mm/hugetlb: NestMMU workaround for hugetlb mprotect RW
upgrade
arch/powerpc/include/asm/book3s/64/hugetlb.h | 12 ++++++++
arch/powerpc/include/asm/book3s/64/pgtable.h | 18 ++++++++++++
arch/powerpc/include/asm/book3s/64/radix.h | 4 +++
arch/powerpc/mm/hugetlbpage-radix.c | 17 ++++++++++++
arch/powerpc/mm/hugetlbpage.c | 29 ++++++++++++++++++++
arch/powerpc/mm/pgtable-book3s64.c | 27 ++++++++++++++++++
arch/powerpc/mm/pgtable-radix.c | 18 ++++++++++++
arch/s390/include/asm/pgtable.h | 5 ++--
arch/s390/mm/pgtable.c | 8 ++++--
arch/x86/include/asm/paravirt.h | 9 ++++--
fs/proc/task_mmu.c | 8 ++++--
include/asm-generic/pgtable.h | 10 +++----
include/linux/hugetlb.h | 18 ++++++++++++
mm/hugetlb.c | 8 ++++--
mm/memory.c | 8 +++---
mm/mprotect.c | 6 ++--
16 files changed, 179 insertions(+), 26 deletions(-)
--
2.19.1
