clocksource: Provide clocksource_arch_init() (d67f34c1) · Commits · 戴 / test

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:

Thomas Gleixner <tglx@linutronix.de> Acked-by:

Andy Lutomirski <luto@kernel.org> Acked-by:

John 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

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);

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