[tip:x86/apic] x86/apic: Provide default send single IPI wrapper

From: tip-bot for Thomas Gleixner
Date: Thu Nov 05 2015 - 09:47:18 EST

Commit-ID: 7e29393b20a1a863a5f9bf48dc71e5cff4035ff5
Gitweb: http://git.kernel.org/tip/7e29393b20a1a863a5f9bf48dc71e5cff4035ff5
Author: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate: Wed, 4 Nov 2015 22:57:07 +0000
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Thu, 5 Nov 2015 13:07:53 +0100

x86/apic: Provide default send single IPI wrapper

Instead of doing the wrapping in the smp code we can provide a default
wrapper for those APICs which insist on cpumasks.

Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Reviewed-by: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Mike Travis <travis@xxxxxxx>
Cc: Daniel J Blueman <daniel@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/20151104220849.631111846@xxxxxxxxxxxxx
arch/x86/include/asm/ipi.h | 1 +
arch/x86/kernel/apic/ipi.c | 8 ++++++++
2 files changed, 9 insertions(+)

diff --git a/arch/x86/include/asm/ipi.h b/arch/x86/include/asm/ipi.h
index 22998a8..cfc9a0d 100644
--- a/arch/x86/include/asm/ipi.h
+++ b/arch/x86/include/asm/ipi.h
@@ -119,6 +119,7 @@ static inline void
native_apic_mem_write(APIC_ICR, cfg);

+extern void default_send_IPI_single(int cpu, int vector);
extern void default_send_IPI_single_phys(int cpu, int vector);
extern void default_send_IPI_mask_sequence_phys(const struct cpumask *mask,
int vector);
diff --git a/arch/x86/kernel/apic/ipi.c b/arch/x86/kernel/apic/ipi.c
index 4fcffbf..eb45fc9 100644
--- a/arch/x86/kernel/apic/ipi.c
+++ b/arch/x86/kernel/apic/ipi.c
@@ -65,6 +65,14 @@ void default_send_IPI_mask_allbutself_phys(const struct cpumask *mask,

+ * Helper function for APICs which insist on cpumasks
+ */
+void default_send_IPI_single(int cpu, int vector)
+ apic->send_IPI_mask(cpumask_of(cpu), vector);
#ifdef CONFIG_X86_32

void default_send_IPI_mask_sequence_logical(const struct cpumask *mask,
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