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| author | Ryan Roberts <ryan.roberts@arm.com> | 2024-01-22 15:05:54 +0300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2024-01-26 10:52:21 +0300 |
| commit | d021b442cf312664811783e92b3d5e4548e92a53 (patch) | |
| tree | 033d6f1afab88e3bef6f9f37c5a3512f565f4067 /tools/testing | |
| parent | 6f9dc684cae638dda0570154509884ee78d0f75c (diff) | |
| download | linux-d021b442cf312664811783e92b3d5e4548e92a53.tar.xz | |
selftests/mm: ksm_tests should only MADV_HUGEPAGE valid memory
ksm_tests was previously mmapping a region of memory, aligning the
returned pointer to a PMD boundary, then setting MADV_HUGEPAGE, but was
setting it past the end of the mmapped area due to not taking the pointer
alignment into consideration. Fix this behaviour.
Up until commit efa7df3e3bb5 ("mm: align larger anonymous mappings on THP
boundaries"), this buggy behavior was (usually) masked because the
alignment difference was always less than PMD-size. But since the
mentioned commit, `ksm_tests -H -s 100` started failing.
Link: https://lkml.kernel.org/r/20240122120554.3108022-1-ryan.roberts@arm.com
Fixes: 325254899684 ("selftests: vm: add KSM huge pages merging time test")
Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
Cc: Pedro Demarchi Gomes <pedrodemargomes@gmail.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'tools/testing')
| -rw-r--r-- | tools/testing/selftests/mm/ksm_tests.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/testing/selftests/mm/ksm_tests.c b/tools/testing/selftests/mm/ksm_tests.c index 380b691d3eb9..b748c48908d9 100644 --- a/tools/testing/selftests/mm/ksm_tests.c +++ b/tools/testing/selftests/mm/ksm_tests.c @@ -566,7 +566,7 @@ static int ksm_merge_hugepages_time(int merge_type, int mapping, int prot, if (map_ptr_orig == MAP_FAILED) err(2, "initial mmap"); - if (madvise(map_ptr, len + HPAGE_SIZE, MADV_HUGEPAGE)) + if (madvise(map_ptr, len, MADV_HUGEPAGE)) err(2, "MADV_HUGEPAGE"); pagemap_fd = open("/proc/self/pagemap", O_RDONLY); |