Pull ia64-clocksource into release branch (c36c282b) · Commits · e / devices / android_kernel_xiaomi_markw

Documentation/kernel-parameters.txt

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		@@ -1154,6 +1154,8 @@ and is between 256 and 4096 characters. It is defined in the file

		nointroute [IA-64]

		nojitter [IA64] Disables jitter checking for ITC timers.

		nolapic [IA-32,APIC] Do not enable or use the local APIC.

		nolapic_timer [IA-32,APIC] Do not use the local APIC timer.

deleted100644 → 0

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		Time Interpolators
		------------------

		Time interpolators are a base of time calculation between timer ticks and
		allow an accurate determination of time down to the accuracy of the time
		source in nanoseconds.

		The architecture specific code typically provides gettimeofday and
		settimeofday under Linux. The time interpolator provides both if an arch
		defines CONFIG_TIME_INTERPOLATION. The arch still must set up timer tick
		operations and call the necessary functions to advance the clock.

		With the time interpolator a standardized interface exists for time
		interpolation between ticks. The provided logic is highly scalable
		and has been tested in SMP situations of up to 512 CPUs.

		If CONFIG_TIME_INTERPOLATION is defined then the architecture specific code
		(or the device drivers - like HPET) may register time interpolators.
		These are typically defined in the following way:

		static struct time_interpolator my_interpolator {
		.frequency = MY_FREQUENCY,
		.source = TIME_SOURCE_MMIO32,
		.shift = 8, /* scaling for higher accuracy */
		.drift = -1, /* Unknown drift */
		.jitter = 0 /* time source is stable */
		};

		void time_init(void)
		{
		....
		/* Initialization of the timer *.
		my_interpolator.address = &my_timer;
		register_time_interpolator(&my_interpolator);
		....
		}

		For more details see include/linux/timex.h and kernel/timer.c.

		Christoph Lameter <christoph@lameter.com>, October 31, 2004

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		@@ -62,7 +62,11 @@ config GENERIC_CALIBRATE_DELAY
		bool
		default y

		config TIME_INTERPOLATION
		config GENERIC_TIME
		bool
		default y

		config GENERIC_TIME_VSYSCALL
		bool
		default y

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		@@ -85,7 +85,7 @@ CONFIG_MMU=y
		CONFIG_SWIOTLB=y
		CONFIG_RWSEM_XCHGADD_ALGORITHM=y
		CONFIG_GENERIC_CALIBRATE_DELAY=y
		CONFIG_TIME_INTERPOLATION=y
		CONFIG_GENERIC_TIME=y
		CONFIG_EFI=y
		CONFIG_GENERIC_IOMAP=y
		CONFIG_SCHED_NO_NO_OMIT_FRAME_POINTER=y

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		@@ -86,7 +86,7 @@ CONFIG_MMU=y
		CONFIG_SWIOTLB=y
		CONFIG_RWSEM_XCHGADD_ALGORITHM=y
		CONFIG_GENERIC_CALIBRATE_DELAY=y
		CONFIG_TIME_INTERPOLATION=y
		CONFIG_GENERIC_TIME=y
		CONFIG_EFI=y
		CONFIG_GENERIC_IOMAP=y
		CONFIG_SCHED_NO_NO_OMIT_FRAME_POINTER=y