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timekeeping: Convert jiffies_seq to seqcount_raw_spinlock_t

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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
This commit is contained in:
Davidlohr Bueso 2020-10-21 12:07:49 -07:00 committed by Thomas Gleixner
parent 3650b228f8
commit 1a2b85f1e2
2 changed files with 3 additions and 2 deletions
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3
kernel/time/jiffies.c
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@ -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)

2
kernel/time/timekeeping.h
View File

@ -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