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Subject[PATCH -next] x86/kvm: Fix build with CONFIG_SMP disabled
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When CONFIG_SMP is disabled, build failed like this:

arch/x86/kernel/kvm.c: In function ‘kvm_alloc_cpumask’:
arch/x86/kernel/kvm.c:823:35: error: ‘kvm_send_ipi_mask_allbutself’
undeclared (first use in this function); did you mean ‘apic_send_IPI_allbutself’?
apic->send_IPI_mask_allbutself = kvm_send_ipi_mask_allbutself;
^~~~~~~~~~~~~~~~~~~~~~~~~~~~
apic_send_IPI_allbutself
arch/x86/kernel/kvm.c:823:35: note: each undeclared identifier
is reported only once for each function it appears in

It is because the declaration of kvm_send_ipi_mask_allbutself() is guarded
by CONFIG_SMP. kvm_send_ipi_mask_allbutself() do not need do anything at
this time.

Signed-off-by: Wang ShaoBo <bobo.shaobowang@huawei.com>
---
arch/x86/kernel/kvm.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index a44398d2bc44..47d65864e29c 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -611,6 +611,13 @@ static int kvm_cpu_down_prepare(unsigned int cpu)
local_irq_enable();
return 0;
}
+
+#else /* !CONFIG_SMP */
+
+static void kvm_send_ipi_mask_allbutself(const struct cpumask *mask, int vector)
+{
+}
+
#endif

static void kvm_flush_tlb_others(const struct cpumask *cpumask,
--
2.25.1
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