Unverified Commit 824c7466 authored by openeuler-ci-bot's avatar openeuler-ci-bot Committed by Gitee
Browse files

!772 timekeeping: Make CLOCKSOURCE_VALIDATE_LAST_CYCLE configurable 

Merge Pull Request from: @liaoyu15 
 
Currently, only x86 architecture supports the CLOCKSOURCE_VALIDATE_LAST_CYCLE
option. This option ensures that the timestamps returned by the clocksource are
monotonically increasing, and helps avoid issues caused by hardware failures.

This commit makes CLOCKSOURCE_VALIDATE_LAST_CYCLE configurable on
the arm64 architecture, helps increase system stability and reliability. 
 
Link:https://gitee.com/openeuler/kernel/pulls/772

 

Reviewed-by: default avatarJialin Zhang <zhangjialin11@huawei.com>
Reviewed-by: default avatarWei Li <liwei391@huawei.com>
Reviewed-by: default avatarLiu Chao <liuchao173@huawei.com>
Signed-off-by: default avatarJialin Zhang <zhangjialin11@huawei.com>
parents 2ddfdd8a c4178985

arch/arm64/configs/openeuler_defconfig

+1 −0
Original line number Diff line number Diff line
@@ -69,6 +69,7 @@ CONFIG_CONTEXT_TRACKING=y 
# CONFIG_CONTEXT_TRACKING_FORCE is not set

CONFIG_NO_HZ=y

CONFIG_HIGH_RES_TIMERS=y

# CONFIG_CLOCKSOURCE_VALIDATE_LAST_CYCLE is not set

# end of Timers subsystem



CONFIG_PREEMPT_NONE=y

kernel/time/Kconfig

+8 −5
Original line number Diff line number Diff line
@@ -17,11 +17,6 @@ config ARCH_CLOCKSOURCE_DATA 
config ARCH_CLOCKSOURCE_INIT

	bool



# Clocksources require validation of the clocksource against the last

# cycle update - x86/TSC misfeature

config CLOCKSOURCE_VALIDATE_LAST_CYCLE

	bool



# Timekeeping vsyscall support

config GENERIC_TIME_VSYSCALL

	bool
@@ -173,5 +168,13 @@ config HIGH_RES_TIMERS 
	  hardware is not capable then this option only increases

	  the size of the kernel image.



# Clocksources require validation of the clocksource against the last

# cycle update - x86/TSC misfeature

config CLOCKSOURCE_VALIDATE_LAST_CYCLE

	bool "Validate last cycle of clocksource"

	help

	  Enable this option to validate the last cycle to prevent issues

	  caused by clocksource going backwards.



endmenu

endif