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

tip-bot for Thomas Gleixner
2015-11-05T14:47:15Z

Commit-ID: 7e29393b20a1a863a5f9bf48dc71e5cff4035ff5
Gitweb: http://git.kernel.org/tip/7e29393b20a1a863a5f9bf48dc71e5cff4035ff5
Author: Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Wed, 4 Nov 2015 22:57:07 +0000
Committer: Thomas Gleixner <tglx@linutronix.de>
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@linutronix.de>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Borislav Petkov <bp@alien.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Mike Travis <travis@sgi.com>
Cc: Daniel J Blueman <daniel@numascale.com>
Link: http://lkml.kernel.org/r/20151104220849.631111846@linutronix.de
---
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,
local_irq_restore(flags);
}

+/*
+ * 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,