The protection attributes are only kept in last level tlb, so protection changing only need invalidate last level tlb, exclude the PWC entries.
Signed-off-by: Xuefeng Wang <wxf.w...@hisilicon.com> --- mm/mprotect.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/mprotect.c b/mm/mprotect.c index 36cb358..0c4303d 100644 --- a/mm/mprotect.c +++ b/mm/mprotect.c @@ -287,7 +287,7 @@ static unsigned long change_protection_range(struct vm_area_struct *vma, /* Only flush the TLB if we actually modified any entries: */ if (pages) - flush_tlb_range(vma, start, end); + __flush_tlb_range(vma, start, end, PAGE_SIZE, true); dec_tlb_flush_pending(mm); return pages; -- 1.7.12.4