Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
timekeeping: Introduce auxiliary timekeepers
Provide timekeepers for auxiliary clocks and initialize them during
boot.
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/20250519083026.350061049@linutronix.de
authored by
Anna-Maria Behnsen
and committed by
Thomas Gleixner
22c62b9a
61680246
+20
-2
+20
-2
kernel/time/timekeeping.c
+20
-2
kernel/time/timekeeping.c
···
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raw_spinlock_t lock;
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} ____cacheline_aligned;
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-
static struct tk_data tk_core;
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static struct tk_data timekeeper_data[TIMEKEEPERS_MAX];
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/* The core timekeeper */
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#define tk_core (timekeeper_data[TIMEKEEPER_CORE])
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/* flag for if timekeeping is suspended */
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int __read_mostly timekeeping_suspended;
···
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.base[0] = FAST_TK_INIT,
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.base[1] = FAST_TK_INIT,
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};
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#ifdef CONFIG_POSIX_AUX_CLOCKS
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static __init void tk_aux_setup(void);
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#else
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static inline void tk_aux_setup(void) { }
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#endif
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unsigned long timekeeper_lock_irqsave(void)
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{
···
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}
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EXPORT_SYMBOL(ktime_get_raw_ts64);
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-
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/**
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* timekeeping_valid_for_hres - Check if timekeeping is suitable for hres
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*/
···
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struct clocksource *clock;
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tkd_basic_setup(&tk_core, TIMEKEEPER_CORE, true);
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tk_aux_setup();
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read_persistent_wall_and_boot_offset(&wall_time, &boot_offset);
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if (timespec64_valid_settod(&wall_time) &&
···
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}
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EXPORT_SYMBOL(hardpps);
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#endif /* CONFIG_NTP_PPS */
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#ifdef CONFIG_POSIX_AUX_CLOCKS
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static __init void tk_aux_setup(void)
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{
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for (int i = TIMEKEEPER_AUX_FIRST; i <= TIMEKEEPER_AUX_LAST; i++)
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tkd_basic_setup(&timekeeper_data[i], i, false);
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}
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#endif /* CONFIG_POSIX_AUX_CLOCKS */