Merge "kernel: time: Add delay after cpu_relax() in tight loops" (cc1d2d5c) · Commits · e / devices / android_kernel_oneplus_sm7250

kernel/time/hrtimer.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -51,6 +51,7 @@
		#include <linux/timer.h>
		#include <linux/freezer.h>
		#include <linux/compat.h>
		#include <linux/delay.h>

		#include <linux/uaccess.h>

		@@ -178,6 +179,7 @@ struct hrtimer_clock_base lock_hrtimer_base(const struct hrtimer timer,
		raw_spin_unlock_irqrestore(&base->cpu_base->lock, *flags);
		}
		cpu_relax();
		ndelay(TIMER_LOCK_TIGHT_LOOP_DELAY_NS);
		}
		}

		@@ -1182,6 +1184,7 @@ int hrtimer_cancel(struct hrtimer *timer)
		if (ret >= 0)
		return ret;
		cpu_relax();
		ndelay(TIMER_LOCK_TIGHT_LOOP_DELAY_NS);
		}
		}
		EXPORT_SYMBOL_GPL(hrtimer_cancel);

+1 −0

Original line number	Diff line number	Diff line
		@@ -163,3 +163,4 @@ DECLARE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases);

		extern u64 get_next_timer_interrupt(unsigned long basej, u64 basem);
		void timer_clear_idle(void);
		#define TIMER_LOCK_TIGHT_LOOP_DELAY_NS 350

+2 −0

Original line number	Diff line number	Diff line
		@@ -957,6 +957,7 @@ static struct timer_base lock_timer_base(struct timer_list timer,
		raw_spin_unlock_irqrestore(&base->lock, *flags);
		}
		cpu_relax();
		ndelay(TIMER_LOCK_TIGHT_LOOP_DELAY_NS);
		}
		}

		@@ -1310,6 +1311,7 @@ int del_timer_sync(struct timer_list *timer)
		if (ret >= 0)
		return ret;
		cpu_relax();
		ndelay(TIMER_LOCK_TIGHT_LOOP_DELAY_NS);
		}
		}
		EXPORT_SYMBOL(del_timer_sync);