Commit ed60c8e2 authored Dec 22, 2025 by Xiu Jianfeng Committed by Andrew Morton Jan 20, 2026

mm/hugetlb_cgroup: fix -Wformat-truncation warning

A false-positive compile warnings with -Wformat-trucation was introduced
by commit 47179fe0 ("mm/hugetlb_cgroup: prepare cftypes based on
template") on arch s390.  Suppress it by replacing snprintf() with
scnprintf().

mm/hugetlb_cgroup.c: In function 'hugetlb_cgroup_file_init':
mm/hugetlb_cgroup.c:829:44: warning: '%s' directive output may be truncated writing up to 1623 bytes into a region of size between 32 and 63 [-Wformat-truncation=]
  829 |   snprintf(cft->name, MAX_CFTYPE_NAME, "%s.%s", buf, tmpl->name);
      |                                            ^~

Link: https://lkml.kernel.org/r/20251222072359.3626182-1-xiujianfeng@huaweicloud.com


Fixes: 47179fe0 ("mm/hugetlb_cgroup: prepare cftypes based on template")
Signed-off-by: Xiu Jianfeng <xiujianfeng@huawei.com>
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202512212332.9lFRbgdS-lkp@intel.com/


Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: "David Hildenbrand (Red Hat)" <david@kernel.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Oscar Salvador <osalvador@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

parent 62451ae3

mm/hugetlb_cgroup.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -822,7 +822,7 @@ hugetlb_cgroup_cfttypes_init(struct hstate h, struct cftype cft,
		for (i = 0; i < tmpl_size; cft++, tmpl++, i++) {
		cft = tmpl;
		/* rebuild the name */
		snprintf(cft->name, MAX_CFTYPE_NAME, "%s.%s", buf, tmpl->name);
		scnprintf(cft->name, MAX_CFTYPE_NAME, "%s.%s", buf, tmpl->name);
		/* rebuild the private */
		cft->private = MEMFILE_PRIVATE(idx, tmpl->private);
		/* rebuild the file_offset */