[merged mm-stable] selftests-mm-workaround-no-way-to-detect-uffd-minor-wp.patch removed from -mm tree

[merged mm-stable] selftests-mm-workaround-no-way-to-detect-uffd-minor-wp.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: selftests/mm: workaround no way to detect uffd-minor + wp
has been removed from the -mm tree.  Its filename was
     selftests-mm-workaround-no-way-to-detect-uffd-minor-wp.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Peter Xu <peterx@redhat.com>
Subject: selftests/mm: workaround no way to detect uffd-minor + wp
Date: Wed, 12 Apr 2023 12:45:17 -0400

Userfaultfd minor+wp mode was very recently added.  The test will fail on
the old kernels at ioctl(UFFDIO_CONTINUE) which is misterious. 
Unfortunately there's no feature bit to detect for this support.

Add a hack to leverage WP_UNPOPULATED to detect whether that feature
existed, since WP_UNPOPULATED was merged right after minor+wp.

Link: https://lkml.kernel.org/r/20230412164517.329152-1-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Dmitry Safonov <0x7f454c46@gmail.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Mike Rapoport (IBM) <rppt@kernel.org>
Cc: Zach O'Keefe <zokeefe@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 tools/testing/selftests/mm/uffd-unit-tests.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

--- a/tools/testing/selftests/mm/uffd-unit-tests.c~selftests-mm-workaround-no-way-to-detect-uffd-minor-wp
+++ a/tools/testing/selftests/mm/uffd-unit-tests.c
@@ -780,7 +780,13 @@ uffd_test_case_t uffd_tests[] = {
 		.mem_targets = MEM_SHMEM | MEM_HUGETLB,
 		.uffd_feature_required =
 		UFFD_FEATURE_MINOR_HUGETLBFS | UFFD_FEATURE_MINOR_SHMEM |
-		UFFD_FEATURE_PAGEFAULT_FLAG_WP,
+		UFFD_FEATURE_PAGEFAULT_FLAG_WP |
+		/*
+		 * HACK: here we leveraged WP_UNPOPULATED to detect whether
+		 * minor mode supports wr-protect.  There's no feature flag
+		 * for it so this is the best we can test against.
+		 */
+		UFFD_FEATURE_WP_UNPOPULATED,
 	},
 	{
 		.name = "minor-collapse",
_

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

selftests-mm-allow-uffd-test-to-skip-properly-with-no-privilege.patch
selftests-mm-drop-sys-dev-test-in-uffd-stress-test.patch
selftests-mm-add-shmem-private-test-to-uffd-stress.patch
selftests-mm-add-uffdio-register-ioctls-test.patch
mm-hugetlb-fix-uffd-wp-during-fork.patch
mm-hugetlb-fix-uffd-wp-bit-lost-when-unsharing-happens.patch
selftests-mm-add-a-few-options-for-uffd-unit-test.patch
selftests-mm-extend-and-rename-uffd-pagemap-test.patch
selftests-mm-rename-cow_extra_libs-to-iouring_extra_libs.patch
selftests-mm-add-tests-for-ro-pinning-vs-fork.patch