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From: Jens Axboe <jens.axboe@oracle.com>
To: linux-kernel@vger.kernel.org
Cc: Alan.Brunelle@hp.com, arjan@linux.intel.com, dgc@sgi.com,
	npiggin@suse.de, Jens Axboe <jens.axboe@oracle.com>
Subject: [PATCH 7/8] kernel: add generic softirq interface for triggering a remote softirq
Date: Thu,  7 Feb 2008 10:19:04 +0100	[thread overview]
Message-ID: <1202375945-29525-8-git-send-email-jens.axboe@oracle.com> (raw)
In-Reply-To: <1202375945-29525-1-git-send-email-jens.axboe@oracle.com>

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

Signed-off-by: Jens Axboe <jens.axboe@oracle.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


  parent reply	other threads:[~2008-02-07  9:23 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-07  9:18 [PATCH 0/8] IO queuing and complete affinity Jens Axboe
2008-02-07  9:18 ` [PATCH 1/8] block: split softirq handling into blk-softirq.c Jens Axboe
2008-02-07  9:18 ` [PATCH 2/8] Add interface for queuing work on a specific CPU Jens Axboe
2008-02-07  9:45   ` Andrew Morton
2008-02-07  9:49     ` Jens Axboe
2008-02-07 17:44       ` Harvey Harrison
2008-02-11 10:51     ` Oleg Nesterov
2008-02-07  9:19 ` [PATCH 3/8] block: make kblockd_schedule_work() take the queue as parameter Jens Axboe
2008-02-07  9:19 ` [PATCH 4/8] x86: add support for remotely triggering the block softirq Jens Axboe
2008-02-07 10:07   ` Ingo Molnar
2008-02-07 10:17     ` Jens Axboe
2008-02-07 10:25       ` Ingo Molnar
2008-02-07 10:31         ` Jens Axboe
2008-02-07 10:38           ` Ingo Molnar
2008-02-07 14:18             ` Jens Axboe
2008-02-07 10:49           ` [patch] block layer: kmemcheck fixes Ingo Molnar
2008-02-07 17:42             ` Linus Torvalds
2008-02-07 17:55               ` Jens Axboe
2008-02-07 19:31               ` Ingo Molnar
2008-02-07 20:06                 ` Jens Axboe
2008-02-08  1:22               ` David Miller
2008-02-08  1:28                 ` Linus Torvalds
2008-02-08 15:09                 ` Arjan van de Ven
2008-02-08 22:44                   ` Nick Piggin
2008-02-08 22:56                     ` Arjan van de Ven
2008-02-08 23:58                       ` Nick Piggin
2008-02-08 11:38               ` Jens Axboe
2008-02-07  9:19 ` [PATCH 5/8] x86-64: add support for remotely triggering the block softirq Jens Axboe
2008-02-07  9:19 ` [PATCH 6/8] ia64: " Jens Axboe
2008-02-07  9:19 ` Jens Axboe [this message]
2008-02-07  9:19 ` [PATCH 8/8] block: add test code for testing CPU affinity Jens Axboe
2008-02-07 15:16 ` [PATCH 0/8] IO queuing and complete affinity Alan D. Brunelle
2008-02-07 18:25 ` IO queuing and complete affinity with threads (was Re: [PATCH 0/8] IO queuing and complete affinity) Jens Axboe
2008-02-07 20:40   ` Alan D. Brunelle
2008-02-08  7:38   ` Nick Piggin
2008-02-08  7:47     ` Jens Axboe
2008-02-08  7:53       ` Nick Piggin
2008-02-08  7:59         ` Jens Axboe
2008-02-08  8:12           ` Nick Piggin
2008-02-08  8:24             ` Jens Axboe
2008-02-08  8:33               ` Nick Piggin
2008-02-11  5:22           ` David Chinner
2008-02-12  8:28             ` Jeremy Higdon

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