Merge tag 'cgroup-for-6.18-rc2-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup

Pull cgroup fixes from Tejun Heo:

 - Fix seqcount lockdep assertion failure in cgroup freezer on
   PREEMPT_RT.

   Plain seqcount_t expects preemption disabled, but PREEMPT_RT
   spinlocks don't disable preemption. Switch to seqcount_spinlock_t to
   properly associate css_set_lock with the freeze timing seqcount.

 - Misc changes including kernel-doc warning fix for misc_res_type enum
   and improved selftest diagnostics.

* tag 'cgroup-for-6.18-rc2-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup:
  cgroup/misc: fix misc_res_type kernel-doc warning
  selftests: cgroup: Use values_close_report in test_cpu
  selftests: cgroup: add values_close_report helper
  cgroup: Fix seqcount lockdep assertion in cgroup freezer

1 files changed, 20 insertions, 0 deletions

diff --git a/tools/testing/selftests/cgroup/lib/include/cgroup_util.h b/tools/testing/selftests/cgroup/lib/include/cgroup_util.h
index 9dc90a1b386d..7ab2824ed7b5 100644
--- a/tools/testing/selftests/cgroup/lib/include/cgroup_util.h
+++ b/tools/testing/selftests/cgroup/lib/include/cgroup_util.h
@@ -25,6 +25,26 @@ static inline int values_close(long a, long b, int err)
 	return labs(a - b) <= (a + b) / 100 * err;
 }
 
+/*
+ * Checks if two given values differ by less than err% of their sum and assert
+ * with detailed debug info if not.
+ */
+static inline int values_close_report(long a, long b, int err)
+{
+	long diff  = labs(a - b);
+	long limit = (a + b) / 100 * err;
+	double actual_err = (a + b) ? (100.0 * diff / (a + b)) : 0.0;
+	int close = diff <= limit;
+
+	if (!close)
+		fprintf(stderr,
+			"[FAIL] actual=%ld expected=%ld | diff=%ld | limit=%ld | "
+			"tolerance=%d%% | actual_error=%.2f%%\n",
+			a, b, diff, limit, err, actual_err);
+
+	return close;
+}
+
 extern ssize_t read_text(const char *path, char *buf, size_t max_len);
 extern ssize_t write_text(const char *path, char *buf, ssize_t len);