WARNING: line length of 81 exceeds 80 columns
#90: FILE: tools/testing/selftests/bpf/veristat.c:227:
+#define log_errno(fmt, ...) log_errno_aux(__FILE__, __LINE__, fmt, ##__VA_ARGS__)

WARNING: Use of volatile is usually wrong: see Documentation/process/volatile-considered-harmful.rst
#165: FILE: tools/testing/selftests/bpf/veristat.c:1331:
+static int snprintf_trunc(char *str, volatile size_t size, const char *fmt, ...)

WARNING: line length of 88 exceeds 80 columns
#180: FILE: tools/testing/selftests/bpf/veristat.c:1346:
+ * Enters new cgroup namespace and mounts cgroupfs at /tmp/veristat-cgroup-mount-XXXXXX,

WARNING: line length of 86 exceeds 80 columns
#196: FILE: tools/testing/selftests/bpf/veristat.c:1362:
+	snprintf_trunc(buf, sizeof(buf), "%s/veristat-cgroup-mount-XXXXXX", P_tmpdir);

CHECK: Comparison to NULL could be written "!mkdtemp"
#197: FILE: tools/testing/selftests/bpf/veristat.c:1363:
+	if (mkdtemp(buf) == NULL) {

WARNING: Prefer strscpy over strcpy - see: https://github.com/KSPP/linux/issues/88
#201: FILE: tools/testing/selftests/bpf/veristat.c:1367:
+	strcpy(env.cgroup_fs_mount, buf);

WARNING: line length of 81 exceeds 80 columns
#205: FILE: tools/testing/selftests/bpf/veristat.c:1371:
+		err = log_errno("mount none %s -t cgroup2", env.cgroup_fs_mount);

WARNING: line length of 91 exceeds 80 columns
#209: FILE: tools/testing/selftests/bpf/veristat.c:1375:
+	snprintf_trunc(buf, sizeof(buf), "%s/cgroup.subtree_control", env.cgroup_fs_mount);

WARNING: line length of 92 exceeds 80 columns
#255: FILE: tools/testing/selftests/bpf/veristat.c:1421:
+	snprintf_trunc(buf, sizeof(buf), "%s/accounting-%d", env.cgroup_fs_mount, getpid());

WARNING: Prefer strscpy over strcpy - see: https://github.com/KSPP/linux/issues/88
#261: FILE: tools/testing/selftests/bpf/veristat.c:1427:
+	strcpy(env.stat_cgroup, buf);

WARNING: line length of 89 exceeds 80 columns
#292: FILE: tools/testing/selftests/bpf/veristat.c:1458:
+		snprintf_trunc(buf, sizeof(buf), "%s/cgroup.procs", env.cgroup_fs_mount);

WARNING: line length of 85 exceeds 80 columns
#307: FILE: tools/testing/selftests/bpf/veristat.c:1473:
+/* Current value of /tmp/veristat-cgroup-mount-XXXXXX/accounting-<pid>/memory.peak */

WARNING: line length of 90 exceeds 80 columns
#326: FILE: tools/testing/selftests/bpf/veristat.c:1492:
+		log_errno("unrecognized %s/memory.peak format: %s", env.stat_cgroup, buf);

total: 0 errors, 12 warnings, 1 checks, 357 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

Commit a52601bc49f6 ("veristat: memory accounting for bpf programs") has style problems, please review.

NOTE: Ignored message types: ALLOC_SIZEOF_STRUCT BAD_REPORTED_BY_LINK CAMELCASE COMMIT_LOG_LONG_LINE GIT_COMMIT_ID MACRO_ARG_REUSE NO_AUTHOR_SIGN_OFF

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.
total: 0 errors, 12 warnings, 1 checks, 357 lines checked