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Subject[patch x86/hyperv] x86, hyperv: Fix build error
9e7827b5ea4c ("x86, hyperv: Get the local APIC timer frequency from the 
hypervisor") breaks the build with some configs because apic.h isn't
directly included:

arch/x86/kernel/cpu/mshyperv.c: In function 'ms_hyperv_init_platform':
arch/x86/kernel/cpu/mshyperv.c:90:3: error: 'lapic_timer_frequency' undeclared (first use in this function)
arch/x86/kernel/cpu/mshyperv.c:90:3: note: each undeclared identifier is reported only once for each function it appears in

Fix it by including asm/apic.h.

Signed-off-by: David Rientjes <>
arch/x86/kernel/cpu/mshyperv.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
--- a/arch/x86/kernel/cpu/mshyperv.c
+++ b/arch/x86/kernel/cpu/mshyperv.c
@@ -25,6 +25,7 @@
#include <asm/idle.h>
#include <asm/irq_regs.h>
#include <asm/i8259.h>
+#include <asm/apic.h>

struct ms_hyperv_info ms_hyperv;

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