Messages in this thread Patch in this message |  | | Date | Fri, 14 Sep 2018 14:50:08 +0200 | From | Thomas Gleixner <> | Subject | [patch 02/11] x86/time: Implement clocksource_arch_init() |
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Runtime validate the VCLOCK_MODE in clocksource::archdata and disable VCLOCK if invalid, which disables the VDSO but keeps the system running.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> --- arch/x86/Kconfig | 1 + arch/x86/kernel/time.c | 16 ++++++++++++++++ 2 files changed, 17 insertions(+)
--- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -48,6 +48,7 @@ config X86 select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI select ANON_INODES select ARCH_CLOCKSOURCE_DATA + select ARCH_CLOCKSOURCE_INIT select ARCH_DISCARD_MEMBLOCK select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI select ARCH_HAS_DEBUG_VIRTUAL --- a/arch/x86/kernel/time.c +++ b/arch/x86/kernel/time.c @@ -10,6 +10,7 @@ * */ +#include <linux/clocksource.h> #include <linux/clockchips.h> #include <linux/interrupt.h> #include <linux/irq.h> @@ -105,3 +106,18 @@ void __init time_init(void) { late_time_init = x86_late_time_init; } + +/* + * Sanity check the vdso related archdata content. + */ +void clocksource_arch_init(struct clocksource *cs) +{ + if (cs->archdata.vclock_mode == VCLOCK_NONE) + return; + + if (cs->archdata.vclock_mode >= VCLOCK_MAX) { + pr_warn("clocksource %s registered with invalid vclock_mode %d. Disabling vclock.\n", + cs->name, cs->archdata.vclock_mode); + cs->archdata.vclock_mode = VCLOCK_NONE; + } +}
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