The patch titled Subject: selftests/mm: fix incorrect buffer->mirror size in hmm2 double_map test has been added to the -mm mm-hotfixes-unstable branch. Its filename is selftests-mm-fixed-incorrect-buffer-mirror-size-in-hmm2-double_map-test.patch

This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches...

This patch will later appear in the mm-hotfixes-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------ From: Donet Tom donettom@linux.ibm.com Subject: selftests/mm: fix incorrect buffer->mirror size in hmm2 double_map test Date: Fri, 27 Sep 2024 00:07:52 -0500

The hmm2 double_map test was failing due to an incorrect buffer->mirror size. The buffer->mirror size was 6, while buffer->ptr size was 6 * PAGE_SIZE. The test failed because the kernel's copy_to_user function was attempting to copy a 6 * PAGE_SIZE buffer to buffer->mirror. Since the size of buffer->mirror was incorrect, copy_to_user failed.

This patch corrects the buffer->mirror size to 6 * PAGE_SIZE.

Test Result without this patch ============================== # RUN hmm2.hmm2_device_private.double_map ... # hmm-tests.c:1680:double_map:Expected ret (-14) == 0 (0) # double_map: Test terminated by assertion # FAIL hmm2.hmm2_device_private.double_map not ok 53 hmm2.hmm2_device_private.double_map

Test Result with this patch =========================== # RUN hmm2.hmm2_device_private.double_map ... # OK hmm2.hmm2_device_private.double_map ok 53 hmm2.hmm2_device_private.double_map

Link: https://lkml.kernel.org/r/20240927050752.51066-1-donettom@linux.ibm.com Fixes: fee9f6d1b8df ("mm/hmm/test: add selftests for HMM") Signed-off-by: Donet Tom donettom@linux.ibm.com Reviewed-by: Muhammad Usama Anjum usama.anjum@collabora.com Cc: J��r��me Glisse jglisse@redhat.com Cc: Kees Cook keescook@chromium.org Cc: Mark Brown broonie@kernel.org Cc: Przemek Kitszel przemyslaw.kitszel@intel.com Cc: Ritesh Harjani (IBM) ritesh.list@gmail.com Cc: Shuah Khan shuah@kernel.org Cc: Ralph Campbell rcampbell@nvidia.com Cc: Jason Gunthorpe jgg@mellanox.com Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

tools/testing/selftests/mm/hmm-tests.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/tools/testing/selftests/mm/hmm-tests.c~selftests-mm-fixed-incorrect-buffer-mirror-size-in-hmm2-double_map-test +++ a/tools/testing/selftests/mm/hmm-tests.c @@ -1657,7 +1657,7 @@ TEST_F(hmm2, double_map)

buffer->fd = -1; buffer->size = size; - buffer->mirror = malloc(npages); + buffer->mirror = malloc(size); ASSERT_NE(buffer->mirror, NULL);

/* Reserve a range of addresses. */ _

Patches currently in -mm which might be from donettom@linux.ibm.com are

selftests-mm-fixed-incorrect-buffer-mirror-size-in-hmm2-double_map-test.patch