linux-kernel - [PATCH 6/8] ia64: add support for remotely triggering the block softirq

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Date:	Thu,  7 Feb 2008 10:19:03 +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 6/8] ia64: add support for remotely triggering the block softirq

Signed-off-by: Jens Axboe <jens.axboe@...cle.com>
---
 arch/ia64/kernel/smp.c |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/arch/ia64/kernel/smp.c b/arch/ia64/kernel/smp.c
index 4e446aa..96f8ffa 100644
--- a/arch/ia64/kernel/smp.c
+++ b/arch/ia64/kernel/smp.c
@@ -80,6 +80,7 @@ static volatile struct call_data_struct *call_data;
 #define IPI_CALL_FUNC		0
 #define IPI_CPU_STOP		1
 #define IPI_KDUMP_CPU_STOP	3
+#define IPI_BLOCK_SOFTIRQ	4
 
 /* This needs to be cacheline aligned because it is written to by *other* CPUs.  */
 static DEFINE_PER_CPU_SHARED_ALIGNED(u64, ipi_operation);
@@ -174,6 +175,14 @@ handle_IPI (int irq, void *dev_id)
 				unw_init_running(kdump_cpu_freeze, NULL);
 				break;
 #endif
+			      case IPI_BLOCK_SOFTIRQ: {
+				unsigned long flags;
+
+				local_irq_save(flags);
+				raise_softirq_irqoff(BLOCK_SOFTIRQ);
+				local_irq_restore(flags);
+				break;
+			      }
 			      default:
 				printk(KERN_CRIT "Unknown IPI on CPU %d: %lu\n", this_cpu, which);
 				break;
@@ -461,6 +470,11 @@ smp_call_function (void (*func) (void *info), void *info, int nonatomic, int wai
 }
 EXPORT_SYMBOL(smp_call_function);
 
+void arch_raise_softirq_on_cpu(int cpuid)
+{
+	send_IPI_single(cpuid, IPI_BLOCK_SOFTIRQ);
+}
+
 /*
  * this function calls the 'stop' function on all other CPUs in the system.
  */
-- 
1.5.4.22.g7a20

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