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timekeeping: Default boot time offset to local_clock()
read_persistent_wall_and_boot_offset() is called during boot to read both the persistent clock and also return the offset between the boot time and the value of persistent clock. Change the default boot_offset from zero to local_clock() so architectures, that do not have a dedicated boot_clock but have early sched_clock(), such as SPARCv9, x86, and possibly more will benefit from this change by getting a better and more consistent estimate of the boot time without need for an arch specific implementation. Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: steven.sistare@oracle.com Cc: daniel.m.jordan@oracle.com Cc: linux@armlinux.org.uk Cc: schwidefsky@de.ibm.com Cc: heiko.carstens@de.ibm.com Cc: john.stultz@linaro.org Cc: sboyd@codeaurora.org Cc: hpa@zytor.com Cc: douly.fnst@cn.fujitsu.com Cc: peterz@infradead.org Cc: prarit@redhat.com Cc: feng.tang@intel.com Cc: pmladek@suse.com Cc: gnomes@lxorguk.ukuu.org.uk Cc: linux-s390@vger.kernel.org Cc: boris.ostrovsky@oracle.com Cc: jgross@suse.com Cc: pbonzini@redhat.com Link: https://lkml.kernel.org/r/20180719205545.16512-17-pasha.tatashin@oracle.com
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@ -1503,14 +1503,17 @@ void __weak read_persistent_clock64(struct timespec64 *ts64)
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* Weak dummy function for arches that do not yet support it.
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* Weak dummy function for arches that do not yet support it.
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* wall_time - current time as returned by persistent clock
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* wall_time - current time as returned by persistent clock
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* boot_offset - offset that is defined as wall_time - boot_time
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* boot_offset - offset that is defined as wall_time - boot_time
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* default to 0.
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* The default function calculates offset based on the current value of
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* local_clock(). This way architectures that support sched_clock() but don't
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* support dedicated boot time clock will provide the best estimate of the
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* boot time.
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*/
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*/
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void __weak __init
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void __weak __init
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read_persistent_wall_and_boot_offset(struct timespec64 *wall_time,
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read_persistent_wall_and_boot_offset(struct timespec64 *wall_time,
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struct timespec64 *boot_offset)
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struct timespec64 *boot_offset)
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{
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{
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read_persistent_clock64(wall_time);
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read_persistent_clock64(wall_time);
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*boot_offset = (struct timespec64){0};
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*boot_offset = ns_to_timespec64(local_clock());
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}
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}
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/* Flag for if timekeeping_resume() has injected sleeptime */
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/* Flag for if timekeeping_resume() has injected sleeptime */
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