On Fri, Nov 02, 2018 at 04:00:17PM +0100, Jann Horn wrote: > On Fri, Nov 2, 2018 at 3:56 PM Kirill A. Shutemov <kirill@xxxxxxxxxxxxx> wrote: > > On Fri, Nov 02, 2018 at 01:22:42PM +0000, Will Deacon wrote: > > > From: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> > > > > > > Commit eb66ae030829605d61fbef1909ce310e29f78821 upstream. > > > > I have never seen the original patch on mailing lists, so I'll reply to > > the backport. > > For context, the original bug report is public at > https://bugs.chromium.org/p/project-zero/issues/detail?id=1695 . Okay. I see. I wounder if it would be cheaper to fix this by taking i_mmap_lock_write() unconditionally in mremap() path rather than do a lot of flushing. We take the lock now only to remap to lower addresses. -- Kirill A. Shutemov
