From: Linus Torvalds <torva...@linux-foundation.org>
We still fall back on the "send mask" versions if an apic definition
doesn't have the single-target version, but at least this allows the
(trivial) case for the common clustered x2apic case.
Signed-off-by: Linus Torvalds <torva...@linux-foundation.org>
Signed-off-by: Thomas Gleixner <t...@linutronix.de>
---
arch/x86/include/asm/apic.h | 1 +
arch/x86/kernel/smp.c | 16 ++++++++++++++--
2 files changed, 15 insertions(+), 2 deletions(-)
Index: linux/arch/x86/include/asm/apic.h
===================================================================
--- linux.orig/arch/x86/include/asm/apic.h
+++ linux/arch/x86/include/asm/apic.h
@@ -303,6 +303,7 @@ struct apic {
unsigned int *apicid);
/* ipi */
+ void (*send_IPI)(int cpu, int vector);
void (*send_IPI_mask)(const struct cpumask *mask, int vector);
void (*send_IPI_mask_allbutself)(const struct cpumask *mask,
int vector);
Index: linux/arch/x86/kernel/smp.c
===================================================================
--- linux.orig/arch/x86/kernel/smp.c
+++ linux/arch/x86/kernel/smp.c
@@ -115,6 +115,18 @@ static atomic_t stopping_cpu = ATOMIC_IN
static bool smp_no_nmi_ipi = false;
/*
+ * Helper wrapper: not all apic definitions support sending to
+ * a single CPU, so we fall back to sending to a mask.
+ */
+static void send_IPI_cpu(int cpu, int vector)
+{
+ if (apic->send_IPI)
+ apic->send_IPI(cpu, vector);
+ else
+ apic->send_IPI_mask(cpumask_of(cpu), vector);
+}
+
+/*
* this function sends a 'reschedule' IPI to another CPU.
* it goes straight through and wastes no time serializing
* anything. Worst case is that we lose a reschedule ...
@@ -125,12 +137,12 @@ static void native_smp_send_reschedule(i
WARN_ON(1);
return;
}
- apic->send_IPI_mask(cpumask_of(cpu), RESCHEDULE_VECTOR);
+ send_IPI_cpu(cpu, RESCHEDULE_VECTOR);
}
void native_send_call_func_single_ipi(int cpu)
{
- apic->send_IPI_mask(cpumask_of(cpu), CALL_FUNCTION_SINGLE_VECTOR);
+ send_IPI_cpu(cpu, CALL_FUNCTION_SINGLE_VECTOR);
}
void native_send_call_func_ipi(const struct cpumask *mask)
--
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