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timekeeping: Encapsulate locking/unlocking of timekeeper_lock

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timekeeper_lock protects updates of timekeeper (tk_core). It is also used
by vdso_update_begin/end() and not only internally by the timekeeper code.

As long as there is only a single timekeeper, this works fine.  But when
the timekeeper infrastructure will be reused for per ptp clock timekeepers,
timekeeper_lock needs to be part of tk_core..

Therefore encapuslate locking/unlocking of timekeeper_lock and make the
lock static.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: John Stultz <jstultz@google.com>
Link: https://lore.kernel.org/all/20241009-devel-anna-maria-b4-timers-ptp-timekeeping-v2-8-554456a44a15@linutronix.de
This commit is contained in:
Thomas Gleixner
2024-10-09 10:29:01 +02:00
parent 20c7b582e8
commit dbdcf8c4ca
3 changed files with 18 additions and 5 deletions
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5
kernel/time/vsyscall.c
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@@ -151,9 +151,8 @@ void update_vsyscall_tz(void)
unsigned long vdso_update_begin(void)
{
struct vdso_data *vdata = __arch_get_k_vdso_data();
unsigned long flags;
unsigned long flags = timekeeper_lock_irqsave();
raw_spin_lock_irqsave(&timekeeper_lock, flags);
vdso_write_begin(vdata);
return flags;
}
@@ -172,5 +171,5 @@ void vdso_update_end(unsigned long flags)
vdso_write_end(vdata);
__arch_sync_vdso_data(vdata);
raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
timekeeper_unlock_irqrestore(flags);
}