Messages in this thread Patch in this message | | | Date | Wed, 03 Jul 2019 12:54:32 +0200 | From | Thomas Gleixner <> | Subject | [patch 01/18] x86/apic: Invoke perf_events_lapic_init() after enabling APIC |
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If the APIC is soft disabled then unmasking an LVT entry does not work and the write is ignored. perf_events_lapic_init() tries to do so.
Move the invocation after the point where the APIC has been enabled.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> --- arch/x86/kernel/apic/apic.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-)
--- a/arch/x86/kernel/apic/apic.c +++ b/arch/x86/kernel/apic/apic.c @@ -1517,7 +1517,6 @@ static void setup_local_APIC(void) int logical_apicid, ldr_apicid; #endif - if (disable_apic) { disable_ioapic_support(); return; @@ -1532,8 +1531,6 @@ static void setup_local_APIC(void) apic_write(APIC_ESR, 0); } #endif - perf_events_lapic_init(); - /* * Double-check whether this APIC is really registered. * This is meaningless in clustered apic mode, so we skip it. @@ -1614,6 +1611,8 @@ static void setup_local_APIC(void) value |= SPURIOUS_APIC_VECTOR; apic_write(APIC_SPIV, value); + perf_events_lapic_init(); + /* * Set up LVT0, LVT1: *
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