linux-kernel - [PATCH 7/8] kernel: add generic softirq interface for triggering a remote softirq

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Date:	Thu,  7 Feb 2008 10:19:04 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	linux-kernel@...r.kernel.org
Cc:	Alan.Brunelle@...com, arjan@...ux.intel.com, dgc@....com,
	npiggin@...e.de, Jens Axboe <jens.axboe@...cle.com>
Subject: [PATCH 7/8] kernel: add generic softirq interface for triggering a remote softirq

This only works for the block softirq, due to the hackish method of
the arch implementations.

Signed-off-by: Jens Axboe <jens.axboe@...cle.com>
---
 include/linux/smp.h |    5 +++++
 kernel/softirq.c    |    7 +++++++
 2 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/include/linux/smp.h b/include/linux/smp.h
index 55232cc..2b546c0 100644
--- a/include/linux/smp.h
+++ b/include/linux/smp.h
@@ -61,6 +61,7 @@ int smp_call_function_single(int cpuid, void (*func) (void *info), void *info,
  * Call a function on all processors
  */
 int on_each_cpu(void (*func) (void *info), void *info, int retry, int wait);
+extern void FASTCALL(raise_softirq_on_cpu(int cpu, unsigned int nr));
 
 #define MSG_ALL_BUT_SELF	0x8000	/* Assume <32768 CPU's */
 #define MSG_ALL			0x8001
@@ -112,6 +113,10 @@ static inline void smp_send_reschedule(int cpu) { }
 })
 #define smp_call_function_mask(mask, func, info, wait) \
 			(up_smp_call_function(func, info))
+#define raise_softirq_on_cpu(cpu, nr)	do {	\
+	WARN_ON(!irqs_disabled());		\
+	raise_softirq_irqoff((nr));		\
+} while (0)
 
 #endif /* !SMP */
 
diff --git a/kernel/softirq.c b/kernel/softirq.c
index d7837d4..0bad5c3 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -663,4 +663,11 @@ int on_each_cpu(void (*func) (void *info), void *info, int retry, int wait)
 	return ret;
 }
 EXPORT_SYMBOL(on_each_cpu);
+
+extern void arch_raise_softirq_on_cpu(int, unsigned int);
+void fastcall raise_softirq_on_cpu(int cpu, unsigned int nr)
+{
+	BUG_ON(nr != BLOCK_SOFTIRQ);
+	arch_raise_softirq_on_cpu(cpu, nr);
+}
 #endif
-- 
1.5.4.22.g7a20

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