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Commit c9218b16 authored by Russell King's avatar Russell King
Browse files

ARM: Allow selection HZ values 



Allow users to configure the Hz rate on implementations which do not have
a fixed clock rate.

Whenever HZ_FIXED is not set through one of its "default" settings, the
user is allowed to select a tick rate from 100, 200, 250, 300, 500Hz
and 1kHz.  This is slightly more choice than with the generic HZ
selection in kernel/Kconfig.hz (which only does 100, 250, 300Hz and
1kHz).  The reason for including 200Hz is that a greater number of other
platforms want that via the fixed rate, and 500Hz just seemed to be a
better middle value than 300Hz (which is of course very close to 250.)

Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent ff69a4c8

arch/arm/Kconfig

+38 −2
Original line number Diff line number Diff line
@@ -1614,13 +1614,49 @@ config ARCH_NR_GPIO 


source kernel/Kconfig.preempt



config HZ

config HZ_FIXED

	int

	default 200 if ARCH_EBSA110 || ARCH_S3C24XX || ARCH_S5P64X0 || \

		ARCH_S5PV210 || ARCH_EXYNOS4

	default AT91_TIMER_HZ if ARCH_AT91

	default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE

	default 100



choice

	depends on !HZ_FIXED

	prompt "Timer frequency"



config HZ_100

	bool "100 Hz"



config HZ_200

	bool "200 Hz"



config HZ_250

	bool "250 Hz"



config HZ_300

	bool "300 Hz"



config HZ_500

	bool "500 Hz"



config HZ_1000

	bool "1000 Hz"



endchoice



config HZ

	int

	default HZ_FIXED if HZ_FIXED

	default 100 if HZ_100

	default 200 if HZ_200

	default 250 if HZ_250

	default 300 if HZ_300

	default 500 if HZ_500

	default 1000



config SCHED_HRTICK

	def_bool HIGH_RES_TIMERS



config SCHED_HRTICK

	def_bool HIGH_RES_TIMERS