From: Rafael J. Wysocki Date: Wed, 17 Jun 2026 16:16:16 +0000 (+0200) Subject: cpuidle: Allow exit latency to exceed target residency X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=68ff4a3ccda9f98c74f23c70c8c7c581f9eee931;p=thirdparty%2Fkernel%2Flinux.git cpuidle: Allow exit latency to exceed target residency Commit 76934e495cdc ("cpuidle: Add sanity check for exit latency and target residency") had added a check to prevent the exit latency of an idle state from exceeding its target residency that later was limited to printing a warning message in that case in commit 4bf944f3fcb6 ("cpuidle: Warn instead of bailing out if target residency check fails"). However, a thorough code inspection with that in mind leads to the conclusion that actually there are no assumptions in cpuidle regarding the relationship between the exit latency and target residency of a given idle state. It is generally assumed that the idle states table provided by a cpuidle driver will be sorted by both the target residency and exit latency in ascending order, but that's a different matter. Accordingly, drop the check in question along with the message printed when it triggers and the inaccurate comment preceding it. Fixes: 4bf944f3fcb6 ("cpuidle: Warn instead of bailing out if target residency check fails") Signed-off-by: Rafael J. Wysocki Reviewed-by: Christian Loehle [ rjw: Subject fixup ] Link: https://patch.msgid.link/3444162.aeNJFYEL58@rafael.j.wysocki Signed-off-by: Rafael J. Wysocki --- diff --git a/drivers/cpuidle/driver.c b/drivers/cpuidle/driver.c index 370664c47e659..e355b42043cf2 100644 --- a/drivers/cpuidle/driver.c +++ b/drivers/cpuidle/driver.c @@ -195,14 +195,6 @@ static void __cpuidle_driver_init(struct cpuidle_driver *drv) s->exit_latency_ns = 0; else s->exit_latency = div_u64(s->exit_latency_ns, NSEC_PER_USEC); - - /* - * Warn if the exit latency of a CPU idle state exceeds its - * target residency which is assumed to never happen in cpuidle - * in multiple places. - */ - if (s->exit_latency_ns > s->target_residency_ns) - pr_warn("Idle state %d target residency too low\n", i); } }