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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri Aug 28, 2026 at 4:11 AM EDT, Yeoreum Yun wrote: > Since glibc commit 321e1fc73f (=E2=80=9Cmalloc: Enable 2MB THP by default= on AArch64=E2=80=9D), > glibc may call madvise(MADV_HUGEPAGE) for sufficiently large allocations > made by memalign(). > > The underlying VMA may start at a different address from the aligned > address returned by memalign(). Furthermore, a subsequent > madvise(MADV_HUGEPAGE) call does not split the VMA because the flag is > already set. > > This causes split_huge_page_test to fail because the check_huge_xxx() > helpers incorrectly require the address returned by memalign() to > match the VMA start address reported in /proc/self/smaps. > > Fix this by using /proc/self/pagemap and /proc/kpageflags instead of > /proc/self/smaps to detect huge pages. > > Reported-by: David Hildenbrand (Arm) > Suggested-by: Zi Yan > Signed-off-by: Yeoreum Yun > --- > tools/testing/selftests/mm/vm_util.c | 145 ++++++++++++++++++++++-------= ------ > tools/testing/selftests/mm/vm_util.h | 1 + > 2 files changed, 92 insertions(+), 54 deletions(-) > > diff --git a/tools/testing/selftests/mm/vm_util.c b/tools/testing/selftes= ts/mm/vm_util.c > index 4821a3563036..083b72d92b14 100644 > --- a/tools/testing/selftests/mm/vm_util.c > +++ b/tools/testing/selftests/mm/vm_util.c > @@ -351,31 +351,13 @@ char *__get_smap_entry(void *addr, const char *patt= ern, char *buf, size_t len) > return entry; > } > =20 > + for (; start < end; start +=3D scan_mapping_size) { > + categories =3D pagemap_scan_get_categories(pagemap_fd, start); > + pfn =3D pagemap_get_pfn(pagemap_fd, start); > + if (pfn =3D=3D -1UL) { > + if (!allow_nonpresent) > + goto out; > + else > + continue; > + } > + if (pageflags_get(pfn, kpageflags_fd, &kpf)) > + ksft_exit_fail_msg("read kpageflags: %s\n", strerror(errno)); > + if (check_pmd_mapping && (categories & PAGE_IS_HUGE)) > + nr_pmd_mappings++; > + if (kpf & KPF_COMPOUND_TAIL) > + continue; > + if (!check_huge_type(categories, kpf, type)) > + goto out; > + } > +=09 There is a trailing tab. > + if (check_pmd_mapping && (nr_pmd_mappings !=3D nr_hpages)) > + goto out; > + ret =3D true; > + > +out: > + close(pagemap_fd); > + close(kpageflags_fd); > + return ret; > } > =20 Otherwise, LGTM. I assume the replacement of memalign(), from the discussion between you and Lorenzo, will be added in a separate patch. For this patch, Reviewed-by: Zi Yan Thanks. --=20 Best Regards, Yan, Zi