+ userfaultfd-selftests-use-user-mode-only.patch added to -mm tree

* + userfaultfd-selftests-use-user-mode-only.patch added to -mm tree
@ 2021-03-11  0:43 akpm
  0 siblings, 0 replies; 2+ messages in thread
From: akpm @ 2021-03-11  0:43 UTC (permalink / raw)
  To: aarcange, axelrasmussen, mm-commits, nadav.amit, peterx


The patch titled
     Subject: userfaultfd/selftests: use user mode only
has been added to the -mm tree.  Its filename is
     userfaultfd-selftests-use-user-mode-only.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/userfaultfd-selftests-use-user-mode-only.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/userfaultfd-selftests-use-user-mode-only.patch

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------------------------------------------------------
From: Peter Xu <peterx@redhat.com>
Subject: userfaultfd/selftests: use user mode only

Patch series "userfaultfd/selftests: A few cleanups".

I wanted to cleanup userfaultfd.c fault handling for a long time.  If it's
not cleaned, when the new code grows the file it'll also grow the size
that needs to be cleaned...  This is my attempt to cleanup the userfaultfd
selftest on fault handling, to use an err() macro instead of either
fprintf() or perror() then another exit() call.

The huge cleanup is done in the last patch.  The first 4 patches are some
other standalone cleanups for the same file, so I put them together.


This patch (of 5):

Userfaultfd selftest does not need to handle kernel initiated fault.  Set
user mode so it can be run even if unprivileged_userfaultfd=0 (which is
the default).

Link: https://lkml.kernel.org/r/20210310004511.51996-2-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Axel Rasmussen <axelrasmussen@google.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Nadav Amit <nadav.amit@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 tools/testing/selftests/vm/userfaultfd.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/tools/testing/selftests/vm/userfaultfd.c~userfaultfd-selftests-use-user-mode-only
+++ a/tools/testing/selftests/vm/userfaultfd.c
@@ -381,7 +381,7 @@ static int userfaultfd_open(uint64_t *fe
 {
 	struct uffdio_api uffdio_api;
 
-	uffd = syscall(__NR_userfaultfd, O_CLOEXEC | O_NONBLOCK);
+	uffd = syscall(__NR_userfaultfd, O_CLOEXEC | O_NONBLOCK | UFFD_USER_MODE_ONLY);
 	if (uffd < 0) {
 		fprintf(stderr,
 			"userfaultfd syscall not available in this kernel\n");
_

Patches currently in -mm which might be from peterx@redhat.com are

hugetlb-dedup-the-code-to-add-a-new-file_region.patch
hugetlg-break-earlier-in-add_reservation_in_range-when-we-can.patch
mm-introduce-page_needs_cow_for_dma-for-deciding-whether-cow.patch
mm-use-is_cow_mapping-across-tree-where-proper.patch
hugetlb-do-early-cow-when-page-pinned-on-src-mm.patch
hugetlb-pass-vma-into-huge_pte_alloc-and-huge_pmd_share.patch
hugetlb-pass-vma-into-huge_pte_alloc-and-huge_pmd_share-fix.patch
hugetlb-userfaultfd-forbid-huge-pmd-sharing-when-uffd-enabled.patch
hugetlb-userfaultfd-forbid-huge-pmd-sharing-when-uffd-enabled-fix.patch
mm-hugetlb-move-flush_hugetlb_tlb_range-into-hugetlbh.patch
hugetlb-userfaultfd-unshare-all-pmds-for-hugetlbfs-when-register-wp.patch
userfaultfd-selftests-use-user-mode-only.patch
userfaultfd-selftests-remove-the-time-check-on-delayed-uffd.patch
userfaultfd-selftests-dropping-verify-check-in-locking_thread.patch
userfaultfd-selftests-only-dump-counts-if-mode-enabled.patch
userfaultfd-selftests-unify-error-handling.patch


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