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Commit d67f34c1 authored by Thomas Gleixner's avatar Thomas Gleixner
Browse files

clocksource: Provide clocksource_arch_init() 



Architectures have extra archdata in the clocksource, e.g. for VDSO
support. There are no sanity checks or general initializations for this
available. Add support for that.

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Acked-by: default avatarAndy Lutomirski <luto@kernel.org>
Acked-by: default avatarJohn Stultz <john.stultz@linaro.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Matt Rickard <matt@softrans.com.au>
Cc: Stephen Boyd <sboyd@kernel.org>
Cc: Florian Weimer <fweimer@redhat.com>
Cc: "K. Y. Srinivasan" <kys@microsoft.com>
Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: devel@linuxdriverproject.org
Cc: virtualization@lists.linux-foundation.org
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Juergen Gross <jgross@suse.com>
Link: https://lkml.kernel.org/r/20180917130706.973042587@linutronix.de
parent 02e42566

include/linux/clocksource.h

+5 −0
Original line number Diff line number Diff line
@@ -241,6 +241,11 @@ static inline void __clocksource_update_freq_khz(struct clocksource *cs, u32 khz 
	__clocksource_update_freq_scale(cs, 1000, khz);

}



#ifdef CONFIG_ARCH_CLOCKSOURCE_INIT

extern void clocksource_arch_init(struct clocksource *cs);

#else

static inline void clocksource_arch_init(struct clocksource *cs) { }

#endif



extern int timekeeping_notify(struct clocksource *clock);

kernel/time/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -12,6 +12,10 @@ config CLOCKSOURCE_WATCHDOG 
config ARCH_CLOCKSOURCE_DATA

	bool



# Architecture has extra clocksource init called from registration

config ARCH_CLOCKSOURCE_INIT

	bool



# Clocksources require validation of the clocksource against the last

# cycle update - x86/TSC misfeature

config CLOCKSOURCE_VALIDATE_LAST_CYCLE

kernel/time/clocksource.c

+2 −0
Original line number Diff line number Diff line
@@ -937,6 +937,8 @@ int __clocksource_register_scale(struct clocksource *cs, u32 scale, u32 freq) 
{

	unsigned long flags;



	clocksource_arch_init(cs);



	/* Initialize mult/shift and max_idle_ns */

	__clocksource_update_freq_scale(cs, scale, freq);