|
@@ -2707,6 +2707,10 @@ static void rcu_sysidle_enter(struct rcu_dynticks *rdtp, int irq)
|
|
|
{
|
|
|
unsigned long j;
|
|
|
|
|
|
+ /* If there are no nohz_full= CPUs, no need to track this. */
|
|
|
+ if (!tick_nohz_full_enabled())
|
|
|
+ return;
|
|
|
+
|
|
|
/* Adjust nesting, check for fully idle. */
|
|
|
if (irq) {
|
|
|
rdtp->dynticks_idle_nesting--;
|
|
@@ -2772,6 +2776,10 @@ void rcu_sysidle_force_exit(void)
|
|
|
*/
|
|
|
static void rcu_sysidle_exit(struct rcu_dynticks *rdtp, int irq)
|
|
|
{
|
|
|
+ /* If there are no nohz_full= CPUs, no need to track this. */
|
|
|
+ if (!tick_nohz_full_enabled())
|
|
|
+ return;
|
|
|
+
|
|
|
/* Adjust nesting, check for already non-idle. */
|
|
|
if (irq) {
|
|
|
rdtp->dynticks_idle_nesting++;
|
|
@@ -2826,6 +2834,10 @@ static void rcu_sysidle_check_cpu(struct rcu_data *rdp, bool *isidle,
|
|
|
unsigned long j;
|
|
|
struct rcu_dynticks *rdtp = rdp->dynticks;
|
|
|
|
|
|
+ /* If there are no nohz_full= CPUs, don't check system-wide idleness. */
|
|
|
+ if (!tick_nohz_full_enabled())
|
|
|
+ return;
|
|
|
+
|
|
|
/*
|
|
|
* If some other CPU has already reported non-idle, if this is
|
|
|
* not the flavor of RCU that tracks sysidle state, or if this
|
|
@@ -2952,6 +2964,10 @@ static void rcu_sysidle_report(struct rcu_state *rsp, int isidle,
|
|
|
static void rcu_sysidle_report_gp(struct rcu_state *rsp, int isidle,
|
|
|
unsigned long maxj)
|
|
|
{
|
|
|
+ /* If there are no nohz_full= CPUs, no need to track this. */
|
|
|
+ if (!tick_nohz_full_enabled())
|
|
|
+ return;
|
|
|
+
|
|
|
rcu_sysidle_report(rsp, isidle, maxj, true);
|
|
|
}
|
|
|
|
|
@@ -2978,7 +2994,8 @@ static void rcu_sysidle_cb(struct rcu_head *rhp)
|
|
|
|
|
|
/*
|
|
|
* Check to see if the system is fully idle, other than the timekeeping CPU.
|
|
|
- * The caller must have disabled interrupts.
|
|
|
+ * The caller must have disabled interrupts. This is not intended to be
|
|
|
+ * called unless tick_nohz_full_enabled().
|
|
|
*/
|
|
|
bool rcu_sys_is_idle(void)
|
|
|
{
|