Commit 1a2b85f1 authored Oct 21, 2020 by Davidlohr Bueso Committed by Thomas Gleixner Oct 26, 2020

timekeeping: Convert jiffies_seq to seqcount_raw_spinlock_t



Use the new api and associate the seqcounter to the jiffies_lock enabling
lockdep support - although for this particular case the write-side locking
and non-preemptibility are quite obvious.

Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20201021190749.19363-1-dave@stgolabs.net

parent 3650b228

kernel/time/jiffies.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -59,7 +59,8 @@ static struct clocksource clocksource_jiffies = {
		};

		__cacheline_aligned_in_smp DEFINE_RAW_SPINLOCK(jiffies_lock);
		__cacheline_aligned_in_smp seqcount_t jiffies_seq;
		__cacheline_aligned_in_smp seqcount_raw_spinlock_t jiffies_seq =
		SEQCNT_RAW_SPINLOCK_ZERO(jiffies_seq, &jiffies_lock);

		#if (BITS_PER_LONG < 64)
		u64 get_jiffies_64(void)

kernel/time/timekeeping.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -26,7 +26,7 @@ extern void do_timer(unsigned long ticks);
		extern void update_wall_time(void);

		extern raw_spinlock_t jiffies_lock;
		extern seqcount_t jiffies_seq;
		extern seqcount_raw_spinlock_t jiffies_seq;

		#define CS_NAME_LEN 32