+ selftests-mm-cleanup-wformat-issues-in-hugetlb-mmap.patch added to mm-hotfixes-unstable branch

+ selftests-mm-cleanup-wformat-issues-in-hugetlb-mmap.patch added to mm-hotfixes-unstable branch

[Andrew Morton]

The patch titled
     Subject: selftests/mm: cleanup -Wformat issues in hugetlb-mmap
has been added to the -mm mm-hotfixes-unstable branch.  Its filename is
     selftests-mm-cleanup-wformat-issues-in-hugetlb-mmap.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-mm-cleanup-wformat-issues-in-hugetlb-mmap.patch

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: Carlos Llamas <cmllamas@google.com>
Subject: selftests/mm: cleanup -Wformat issues in hugetlb-mmap
Date: Sun, 27 Sep 2026 16:24:18 +0000

Commit ae571cd6015c ("selftests/mm: hugetlb-mmap: add setup of HugeTLB
pages") and commit 9c5a65f374f8 ("selftests/mm: merge map_hugetlb into
hugepage-mmap") added logs of 'hugepage_size' which has a size_t type.
However, the incorrect format specifier '%lu' was used which triggers
-Wformat warnings when building for 32-bit:

  hugetlb-mmap.c:125:55: warning: format specifies type 'unsigned long'
  but the argument has type 'size_t' (aka 'unsigned int') [-Wformat]
    125 | ksft_print_msg("Default size hugepages (%lu kB)\n", hugepage_size >> 10);
        |                                         ~~~         ^~~~~~~~~~~~~~~~~~~
        |                                         %zu

  hugetlb-mmap.c:134:47: warning: format specifies type 'unsigned long'
  but the argument has type 'size_t' (aka 'unsigned int') [-Wformat]
    134 | ksft_exit_skip("Not enough %lu Kb pages\n", hugepage_size >> 10);
        |                            ~~~              ^~~~~~~~~~~~~~~~~~~
        |                            %zu

Fix this by switching to the expected '%zu' format specifier.

Link: https://lore.kernel.org/20260927162419.820609-1-cmllamas@google.com
Fixes: ae571cd6015c ("selftests/mm: hugetlb-mmap: add setup of HugeTLB pages")
Fixes: 9c5a65f374f8 ("selftests/mm: merge map_hugetlb into hugepage-mmap")
Signed-off-by: Carlos Llamas <cmllamas@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Vlastimil Babka <vbabka@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: <stable@vger.kernel.org>
---

 tools/testing/selftests/mm/hugetlb-mmap.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/tools/testing/selftests/mm/hugetlb-mmap.c~selftests-mm-cleanup-wformat-issues-in-hugetlb-mmap
+++ a/tools/testing/selftests/mm/hugetlb-mmap.c
@@ -122,7 +122,7 @@ int main(int argc, char **argv)
 		hugepage_size = default_huge_page_size();
 		if (!hugepage_size)
 			ksft_exit_skip("Could not detect default hugetlb page size.");
-		ksft_print_msg("Default size hugepages (%lu kB)\n", hugepage_size >> 10);
+		ksft_print_msg("Default size hugepages (%zu kB)\n", hugepage_size >> 10);
 	}
 
 	/* munmap will fail if the length is not page aligned */
@@ -131,7 +131,7 @@ int main(int argc, char **argv)
 
 	hugetlb_set_nr_pages(hugepage_size, nr);
 	if (hugetlb_free_pages(hugepage_size) < nr)
-		ksft_exit_skip("Not enough %lu Kb pages\n", hugepage_size >> 10);
+		ksft_exit_skip("Not enough %zu Kb pages\n", hugepage_size >> 10);
 
 	ksft_set_plan(2);
 	ksft_print_msg("Mapping %lu Mbytes\n", (unsigned long)length >> 20);
_

Patches currently in -mm which might be from cmllamas@google.com are

selftests-mm-cleanup-wformat-issues-in-hugetlb-mmap.patch