The patch titled Subject: selftests: mm: fix map_hugetlb failure on 64K page size systems has been added to the -mm mm-hotfixes-unstable branch. Its filename is selftests-mm-fix-map_hugetlb-failure-on-64k-page-size-systems.patch

This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches...

This patch will later appear in the mm-hotfixes-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------ From: Nico Pache npache@redhat.com Subject: selftests: mm: fix map_hugetlb failure on 64K page size systems Date: Fri, 19 Jan 2024 06:14:29 -0700

On systems with 64k page size and 512M huge page sizes, the allocation and test succeeds but errors out at the munmap. As the comment states, munmap will failure if its not HUGEPAGE aligned. This is due to the length of the mapping being 1/2 the size of the hugepage causing the munmap to not be hugepage aligned. Fix this by making the mapping length the full hugepage if the hugepage is larger than the length of the mapping.

Link: https://lkml.kernel.org/r/20240119131429.172448-1-npache@redhat.com Fixes: fa7b9a805c79 ("tools/selftest/vm: allow choosing mem size and page size in map_hugetlb") Signed-off-by: Nico Pache npache@redhat.com Cc: Donet Tom donettom@linux.vnet.ibm.com Cc: Shuah Khan shuah@kernel.org Cc: Christophe Leroy christophe.leroy@c-s.fr Cc: Michael Ellerman mpe@ellerman.id.au Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

tools/testing/selftests/mm/map_hugetlb.c | 7 +++++++ 1 file changed, 7 insertions(+)

--- a/tools/testing/selftests/mm/map_hugetlb.c~selftests-mm-fix-map_hugetlb-failure-on-64k-page-size-systems +++ a/tools/testing/selftests/mm/map_hugetlb.c @@ -15,6 +15,7 @@ #include <unistd.h> #include <sys/mman.h> #include <fcntl.h> +#include "vm_util.h"

#define LENGTH (256UL*1024*1024) #define PROTECTION (PROT_READ | PROT_WRITE) @@ -58,10 +59,16 @@ int main(int argc, char **argv) { void *addr; int ret; + size_t hugepage_size; size_t length = LENGTH; int flags = FLAGS; int shift = 0;

+ hugepage_size = default_huge_page_size(); + /* munmap with fail if the length is not page aligned */ + if (hugepage_size > length) + length = hugepage_size; + if (argc > 1) length = atol(argv[1]) << 20; if (argc > 2) { _

Patches currently in -mm which might be from npache@redhat.com are

selftests-mm-fix-map_hugetlb-failure-on-64k-page-size-systems.patch selftests-mm-perform-some-system-cleanup-before-using-hugepages.patch