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DLJ1vzfbY2dQWXMBhYYYu2Sp7dWQWXCg+WJaNtAffN+1qckqJdHEaGwC852LhSQEZ3x9553GsJXIsN3irX1WUiLPx8p5GoQjO3ha8ArjuGakUV7494XI2KvQJ+HyiygUdkJtKIsV2VYfOMSE/YENGZRMDrl8UI6etmjI+gGUjf8sq+jD/UdqkNI7gbjAh0Yu7gMEj1SECPKWTv3LjuAX1lXCxEpv9FWDJB7eDfgW2Qg069bvZh7SI2dxR+g/tjysfH/+3UmPFXoswI+c6qGCEtGEgUWbDPeMqXg+SFaNKTI/gOUHcVFkYZPUe84Nr+EfWyXXngpzbwbIbAyhfHU7IBl25YTePqC0YePTk6gQiAlEVh5wcjTlzzL1BBxtu0TRDA+qEa0++zyJOZxRnVS+hU+4uUaNc6xNMdWVp Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 19 Mar 2026, at 12:06, Chunyu Hu wrote: > When thp is not available, just skip the collape tests to avoid the fal= se > negative. > > Without the change, run with a thp disabled kernel: > ./run_vmtests.sh -t madv_guard -n 1 > > # RUN guard_regions.anon.collapse ... > # guard-regions.c:2217:collapse:Expected madvise(ptr, size, MADV_NOHU= GEPAGE) (-1) =3D=3D 0 (0) > # collapse: Test terminated by assertion > # FAIL guard_regions.anon.collapse > not ok 2 guard_regions.anon.collapse > > # RUN guard_regions.shmem.collapse ... > # guard-regions.c:2217:collapse:Expected madvise(ptr, size, MADV_NOHU= GEPAGE) (-1) =3D=3D 0 (0) > # collapse: Test terminated by assertion > # FAIL guard_regions.shmem.collapse > not ok 32 guard_regions.shmem.collapse > > # RUN guard_regions.file.collapse ... > # guard-regions.c:2217:collapse:Expected madvise(ptr, size, MADV_NOHU= GEPAGE) (-1) =3D=3D 0 (0) > # collapse: Test terminated by assertion > # FAIL guard_regions.file.collapse > not ok 62 guard_regions.file.collapse > > # FAILED: 87 / 90 tests passed. > # 17 skipped test(s) detected. Consider enabling relevant config opti= ons to improve coverage. > # Totals: pass:70 fail:3 xfail:0 xpass:0 skip:17 error:0 > > With this change, run with thp disabled kernel: > ./run_vmtests.sh -t madv_guard -n 1 > > # RUN guard_regions.anon.collapse ... > # SKIP Transparent Hugepages not available > # OK guard_regions.anon.collapse > ok 2 guard_regions.anon.collapse # SKIP Transparent Hugepages not ava= ilable > > # RUN guard_regions.file.collapse ... > # SKIP Transparent Hugepages not available > # OK guard_regions.file.collapse > ok 62 guard_regions.file.collapse # SKIP Transparent Hugepages not av= ailable > > # RUN guard_regions.shmem.collapse ... > # SKIP Transparent Hugepages not available > # OK guard_regions.shmem.collapse > ok 32 guard_regions.shmem.collapse # SKIP Transparent Hugepages not a= vailable > > # PASSED: 90 / 90 tests passed. > # 20 skipped test(s) detected. Consider enabling relevant config opti= ons to improve coverage. > # Totals: pass:70 fail:0 xfail:0 xpass:0 skip:20 error:0 > > CC: Li Wang > Signed-off-by: Chunyu Hu > --- > Changes in v4: > - use thp_available instead of thp_is_enabled() as when thp is set to= > never, madvise(MADV_COLLAPSE) will still succeed by design. So a > failure in madvise(MADV_COLLAPSE) on guard region will verify guard= > region denies it. This is suggested from AI. > - removed the 'Reviewed-by' and 'Acked-by' as the code changes. Sorry= for > that but it seems the changes is a little huge? (1 out of 2 lines).= =2E > Changes in v3: > - commit message: update the log snippet with where the fail happens = and > add the '-n1' to the command. > - fix the 'false positive' to 'false negative' > - add reviwed by from Mike > Changes in v2: > - add reviewed by from Zi and Lorenzo > - add acked-by from David > --- > tools/testing/selftests/mm/guard-regions.c | 4 ++++ > 1 file changed, 4 insertions(+) > Reviewed-by: Zi Yan Best Regards, Yan, Zi