From: Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx> Subject: userfaultfd: non-cooperative: add madvise() event for MADV_REMOVE request When a page is removed from a shared mapping, the uffd reader should be notified, so that it won't attempt to handle #PF events for the removed pages. We can reuse the UFFD_EVENT_REMOVE because from the uffd monitor point of view, the semantices of madvise(MADV_DONTNEED) and madvise(MADV_REMOVE) is exactly the same. Link: http://lkml.kernel.org/r/1484814154-1557-3-git-send-email-rppt@xxxxxxxxxxxxxxxxxx Signed-off-by: Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx> Reviewed-by: Andrea Arcangeli <aarcange@xxxxxxxxxx> Acked-by: Hillf Danton <hillf.zj@xxxxxxxxxxxxxxx> Acked-by: Pavel Emelyanov <xemul@xxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/madvise.c | 1 + 1 file changed, 1 insertion(+) diff -puN mm/madvise.c~userfaultfd-non-cooperative-add-madvise-event-for-madv_remove-request mm/madvise.c --- a/mm/madvise.c~userfaultfd-non-cooperative-add-madvise-event-for-madv_remove-request +++ a/mm/madvise.c @@ -520,6 +520,7 @@ static long madvise_remove(struct vm_are * mmap_sem. */ get_file(f); + userfaultfd_remove(vma, prev, start, end); up_read(¤t->mm->mmap_sem); error = vfs_fallocate(f, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, _ -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
