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This size is not guaranteed to be > aligned to the system hugepage size, which can cause munmap() to fail > and mremap() to succeed where a failure is expected. > > Align the mapping length to the runtime hugepage size using > default_huge_page_size() to ensure the mapping is properly > aligned. Also handle the case where > default_huge_page_size() returns 0 by skipping the test. > > 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 > ------------------------- > 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 > > Fixes: f77a286de48c ("mm, hugepages: make memory size variable in hugep= age-mremap selftest") > Signed-off-by: Sayali Patil > --- > tools/testing/selftests/mm/hugepage-mremap.c | 10 ++++++++++ > 1 file changed, 10 insertions(+) > > diff --git a/tools/testing/selftests/mm/hugepage-mremap.c b/tools/testi= ng/selftests/mm/hugepage-mremap.c > index b8f7d92e5a35..f66e4d806477 100644 > --- a/tools/testing/selftests/mm/hugepage-mremap.c > +++ b/tools/testing/selftests/mm/hugepage-mremap.c > @@ -32,6 +32,7 @@ > > #define PROTECTION (PROT_READ | PROT_WRITE | PROT_EXEC) > #define FLAGS (MAP_SHARED | MAP_ANONYMOUS) > +#define ALIGN(x, a) (((x) + ((a) - 1)) & ~((a) - 1)) > > static void check_bytes(char *addr) > { > @@ -110,6 +111,7 @@ int main(int argc, char *argv[]) > { > size_t length =3D 0; > int ret =3D 0, fd; > + size_t hpage_size; > > ksft_print_header(); > ksft_set_plan(1); > @@ -126,6 +128,14 @@ int main(int argc, char *argv[]) > length =3D DEFAULT_LENGTH_MB; > > length =3D MB_TO_BYTES(length); > + > + hpage_size =3D default_huge_page_size(); > + if (!hpage_size) > + ksft_exit_skip("Unable to determine huge page size\n"); > + > + /* Ensure length is hugepage aligned */ > + length =3D ALIGN(length, hpage_size); > + > fd =3D memfd_create(argv[0], MFD_HUGETLB); > if (fd < 0) > ksft_exit_fail_msg("Open failed: %s\n", strerror(errno)); > -- = > 2.52.0 LGTM. BTW, it seems that multiple files, pkey-helpers.h, migration.c, uffed-unit-test.c, hmm-tests.c, have their own ALIGN or ALIGN_UP. They can be moved to vm_utils.h, later if someone wants to do a cleanup. Reviewed-by: Zi Yan Best Regards, Yan, Zi