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However, when the huge page size > is large (e.g. 1GB), 10MB is smaller than a single huge page. > As a result, the test does not trigger PMD sharing and the > corresponding unshare path in mremap(), causing the > test to fail (mremap succeeds where a failure is expected). > > Update run_vmtest.sh to use twice the huge page size when the huge page= > size exceeds 10MB, while retaining the 10MB default for smaller huge > pages. This ensures the test exercises the intended PMD sharing and > unsharing paths for larger huge page sizes. > > Before patch: > running ./hugepage-mremap > ------------------------------ > TAP version 13 > 1..1 > Map haddr: Returned address is 0x7eaa40000000 > Map daddr: Returned address is 0x7daa40000000 > Map vaddr: Returned address is 0x7faa40000000 > Address returned by mmap() =3D 0x7fffaa600000 > Mremap: Returned address is 0x7faa40000000 > First hex is 0 > First hex is 3020100 > Bail out! mremap: Expected failure, but call succeeded > Planned tests !=3D run tests (1 !=3D 0) > Totals: pass:0 fail:0 xfail:0 xpass:0 skip:0 error:0 > [FAIL] > not ok 1 hugepage-mremap # exit=3D1 > > Before patch: > running ./hugepage-mremap > ------------------------------ > TAP version 13 > 1..1 > Map haddr: Returned address is 0x7eaa40000000 > Map daddr: Returned address is 0x7daa40000000 > Map vaddr: Returned address is 0x7faa40000000 > Address returned by mmap() =3D 0x7fffaa600000 > Mremap: Returned address is 0x7faa40000000 > First hex is 0 > First hex is 3020100 > Bail out! mremap: Expected failure, but call succeeded > Planned tests !=3D run tests (1 !=3D 0) > Totals: pass:0 fail:0 xfail:0 xpass:0 skip:0 error:0 > [FAIL] > not ok 1 hugepage-mremap # exit=3D1 > > After patch: > running ./hugepage-mremap 2048 > ------------------------------ > TAP version 13 > 1..1 > Map haddr: Returned address is 0x7eaa40000000 > Map daddr: Returned address is 0x7daa40000000 > Map vaddr: Returned address is 0x7faa40000000 > Address returned by mmap() =3D 0x7fff13000000 > Mremap: Returned address is 0x7faa40000000 > First hex is 0 > First hex is 3020100 > ok 1 Read same data > Totals: pass:1 fail:0 xfail:0 xpass:0 skip:0 error:0 > [PASS] > ok 1 hugepage-mremap 2048 > > Fixes: f77a286de48c ("mm, hugepages: make memory size variable in hugep= age-mremap selftest") > Signed-off-by: Sayali Patil > --- > tools/testing/selftests/mm/run_vmtests.sh | 13 ++++++++++++- > 1 file changed, 12 insertions(+), 1 deletion(-) > Makes sense. Acked-by: Zi Yan Best Regards, Yan, Zi