PR_SET_VMA_ANON_NAME returns EINVAL on a kernel built without CONFIG_ANON_VMA_NAME, and every case in the renaming test then fails on a feature that is not there.
Probe once in the fixture setup with a throwaway mapping and skip when the kernel answers EINVAL. Only that error means the feature is missing; the test still checks that an invalid name is refused with EINVAL later, on a kernel that has it. Signed-off-by: Eva Kurchatova <[email protected]> --- .../testing/selftests/prctl/set-anon-vma-name-test.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/tools/testing/selftests/prctl/set-anon-vma-name-test.c b/tools/testing/selftests/prctl/set-anon-vma-name-test.c index 5f9589534da8..2d49a5114497 100644 --- a/tools/testing/selftests/prctl/set-anon-vma-name-test.c +++ b/tools/testing/selftests/prctl/set-anon-vma-name-test.c @@ -80,6 +80,17 @@ FIXTURE(vma) { FIXTURE_SETUP(vma) { char template[] = "./set-anon-vma-test-XXXXXX"; + void *probe; + int res; + + /* Naming anonymous VMAs needs CONFIG_ANON_VMA_NAME. */ + probe = mmap(NULL, AREA_SIZE, PROT_READ | PROT_WRITE, + MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); + ASSERT_NE(probe, MAP_FAILED); + res = rename_vma((unsigned long)probe, AREA_SIZE, GOOD_NAME); + munmap(probe, AREA_SIZE); + if (res == -EINVAL) + SKIP(return, "CONFIG_ANON_VMA_NAME is not enabled"); self->ptr_anon = mmap(NULL, AREA_SIZE, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); -- 2.55.0
