linux-kernel - [PATCH 1/2] rt/threadirqs: don't need to save irqs in do

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Date:	Thu, 12 Feb 2009 19:27:08 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] rt/threadirqs: don't need to save irqs in do_hardirq()

do_hardirq() has only one caller do_irqd() in a path where irq are already
disabled. So we don't need to save irqs while holding desc->lock

Replace spin_lock_irqsave by spin_lock.

Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
---
 kernel/irq/manage.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index ed7c5e3..6e9baf8 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -905,7 +905,7 @@ static void do_hardirq(struct irq_desc *desc)
 {
 	unsigned long flags;
 
-	spin_lock_irqsave(&desc->lock, flags);
+	spin_lock(&desc->lock);
 
 	if (!(desc->status & IRQ_INPROGRESS))
 		goto out;
@@ -921,7 +921,7 @@ static void do_hardirq(struct irq_desc *desc)
 	else
 		thread_do_irq(desc);
  out:
-	spin_unlock_irqrestore(&desc->lock, flags);
+	spin_unlock(&desc->lock);
 
 	if (waitqueue_active(&desc->wait_for_handler))
 		wake_up(&desc->wait_for_handler);
-- 
1.6.1


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