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    Subject[patch 02/14] x86/apic: Implement single target IPI function for x2apic_cluster
    From: Linus Torvalds <torvalds@linux-foundation.org>

    [ 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@linux-foundation.org>
    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
    ---
    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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