On Sat, Feb 23, 2019 at 02:47:27PM +0800, Xuefeng Wang wrote: > 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);
You are changing a generic file to call an arm64-internal function, breaking all the other architectures, so NAK. Do you actually see any performance improvement? -- Catalin
