Commit 6db0f533 authored by Zihuan Zhang's avatar Zihuan Zhang Committed by Rafael J. Wysocki
Browse files

cpufreq: preserve freq_table_sorted across suspend/hibernate 



During S3/S4 suspend and resume, cpufreq policies are not freed or
recreated; the freq_table and policy structure remain intact. However,
set_freq_table_sorted() currently resets policy->freq_table_sorted to
UNSORTED unconditionally, which is unnecessary since the table order
does not change across suspend/resume.

This patch adds a check to skip validation if policy->freq_table_sorted
is already ASCENDING or DESCENDING. This avoids unnecessary traversal
of the frequency table on S3/S4 resume or repeated online events,
reducing overhead while preserving correctness.

Signed-off-by: default avatarZihuan Zhang <zhangzihuan@kylinos.cn>
Link: https://patch.msgid.link/20251011072420.11495-1-zhangzihuan@kylinos.cn


Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 673e75ea

drivers/cpufreq/cpufreq.c

+6 −3
Original line number Diff line number Diff line
@@ -1421,9 +1421,12 @@ static int cpufreq_policy_online(struct cpufreq_policy *policy, 
		 * If there is a problem with its frequency table, take it

		 * offline and drop it.

		 */

		if (policy->freq_table_sorted != CPUFREQ_TABLE_SORTED_ASCENDING &&

		    policy->freq_table_sorted != CPUFREQ_TABLE_SORTED_DESCENDING) {

			ret = cpufreq_table_validate_and_sort(policy);

			if (ret)

				goto out_offline_policy;

		}



		/* related_cpus should at least include policy->cpus. */

		cpumask_copy(policy->related_cpus, policy->cpus);