[patch 02/14] x86/apic: Implement single target IPI function for x2apic_cluster

[Thomas Gleixner]

From: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>

[ tglx: Split it out from the patch which provides the new callback
  	and wrapped it into local_irq_save/restore ]

Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
 arch/x86/kernel/apic/x2apic_cluster.c |   12 ++++++++++++
 1 file changed, 12 insertions(+)

Index: linux/arch/x86/kernel/apic/x2apic_cluster.c
===================================================================
--- linux.orig/arch/x86/kernel/apic/x2apic_cluster.c
+++ linux/arch/x86/kernel/apic/x2apic_cluster.c
@@ -23,6 +23,17 @@ static inline u32 x2apic_cluster(int cpu
 	return per_cpu(x86_cpu_to_logical_apicid, cpu) >> 16;
 }
 
+static void x2apic_send_IPI(int cpu, int vector)
+{
+	u32 dest = per_cpu(x86_cpu_to_logical_apicid, cpu);
+	unsigned long flags;
+
+	x2apic_wrmsr_fence();
+	local_irq_save(flags);
+	__x2apic_send_IPI_dest(dest, vector, APIC_DEST_LOGICAL);
+	local_irq_restore(flags);
+}
+
 static void
 __x2apic_send_IPI_mask(const struct cpumask *mask, int vector, int apic_dest)
 {
@@ -266,6 +277,7 @@ static struct apic apic_x2apic_cluster =
 
 	.cpu_mask_to_apicid_and		= x2apic_cpu_mask_to_apicid_and,
 
+	.send_IPI			= x2apic_send_IPI,
 	.send_IPI_mask			= x2apic_send_IPI_mask,
 	.send_IPI_mask_allbutself	= x2apic_send_IPI_mask_allbutself,
 	.send_IPI_allbutself		= x2apic_send_IPI_allbutself,


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