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x86/time: Implement clocksource_arch_init()
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> Acked-by: Andy Lutomirski <luto@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Matt Rickard <matt@softrans.com.au> Cc: Stephen Boyd <sboyd@kernel.org> Cc: John Stultz <john.stultz@linaro.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/20180917130707.069167446@linutronix.de
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@ -48,6 +48,7 @@ config X86
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select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI
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select ANON_INODES
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select ARCH_CLOCKSOURCE_DATA
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select ARCH_CLOCKSOURCE_INIT
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select ARCH_DISCARD_MEMBLOCK
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select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI
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select ARCH_HAS_DEBUG_VIRTUAL
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@ -10,6 +10,7 @@
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*
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*/
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#include <linux/clocksource.h>
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#include <linux/clockchips.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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@ -105,3 +106,18 @@ void __init time_init(void)
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{
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late_time_init = x86_late_time_init;
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}
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/*
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* Sanity check the vdso related archdata content.
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*/
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void clocksource_arch_init(struct clocksource *cs)
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{
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if (cs->archdata.vclock_mode == VCLOCK_NONE)
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return;
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if (cs->archdata.vclock_mode > VCLOCK_MAX) {
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pr_warn("clocksource %s registered with invalid vclock_mode %d. Disabling vclock.\n",
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cs->name, cs->archdata.vclock_mode);
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cs->archdata.vclock_mode = VCLOCK_NONE;
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}
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}
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