[v1,2/5] cpuidle: Use s64 as exit_latency_ns and target_residency_ns data type
diff mbox series

Message ID 1850839.PYKUYFuaPT@kreacher
State New, archived
Headers show
Series
  • cpuidle: Take possible negative "sleep length" values into account
Related show

Commit Message

Rafael J. Wysocki March 29, 2021, 6:15 p.m. UTC
From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>

Subsequent changes will cause the exit_latency_ns and target_residency_ns
fields in struct cpuidle_state to be used in computations in which data
type conversions to u64 may turn a negative number close to zero into
a verly large positive number leading to incorrect results.

In preparation for that, change the data type of the fields mentioned
above to s64, but ensure that they will not be negative themselves.

No intentional functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/cpuidle/driver.c |    4 ++++
 include/linux/cpuidle.h  |    4 ++--
 2 files changed, 6 insertions(+), 2 deletions(-)

Patch
diff mbox series

Index: linux-pm/include/linux/cpuidle.h
===================================================================
--- linux-pm.orig/include/linux/cpuidle.h
+++ linux-pm/include/linux/cpuidle.h
@@ -49,8 +49,8 @@  struct cpuidle_state {
 	char		name[CPUIDLE_NAME_LEN];
 	char		desc[CPUIDLE_DESC_LEN];
 
-	u64		exit_latency_ns;
-	u64		target_residency_ns;
+	s64		exit_latency_ns;
+	s64		target_residency_ns;
 	unsigned int	flags;
 	unsigned int	exit_latency; /* in US */
 	int		power_usage; /* in mW */
Index: linux-pm/drivers/cpuidle/driver.c
===================================================================
--- linux-pm.orig/drivers/cpuidle/driver.c
+++ linux-pm/drivers/cpuidle/driver.c
@@ -181,9 +181,13 @@  static void __cpuidle_driver_init(struct
 		 */
 		if (s->target_residency > 0)
 			s->target_residency_ns = s->target_residency * NSEC_PER_USEC;
+		else if (s->target_residency_ns < 0)
+			s->target_residency_ns = 0;
 
 		if (s->exit_latency > 0)
 			s->exit_latency_ns = s->exit_latency * NSEC_PER_USEC;
+		else if (s->exit_latency_ns < 0)
+			s->exit_latency_ns =  0;
 	}
 }