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authorThomas Gleixner <tglx@linutronix.de>2012-01-31 13:01:27 +0100
committerClark Williams <williams@redhat.com>2012-02-15 10:32:53 -0600
commit9a9ded51044ea43128a49626748d26d45eee8ed6 (patch)
tree6072c0d22e9aae39f666954b1bb5d11b0c4ad1e9 /kernel/irq/manage.c
parent94be87227929747397f7bab39c205ccdde24c5b5 (diff)
genirq: Allow disabling of softirq processing in irq thread context
The processing of softirqs in irq thread context is a performance gain for the non-rt workloads of a system, but it's counterproductive for interrupts which are explicitely related to the realtime workload. Allow such interrupts to prevent softirq processing in their thread context. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: stable-rt@vger.kernel.org
Diffstat (limited to 'kernel/irq/manage.c')
-rw-r--r--kernel/irq/manage.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 09ba67d9ceb7..fd301aa5665d 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -742,7 +742,15 @@ irq_forced_thread_fn(struct irq_desc *desc, struct irqaction *action)
local_bh_disable();
ret = action->thread_fn(action->irq, action->dev_id);
irq_finalize_oneshot(desc, action, false);
- local_bh_enable();
+ /*
+ * Interrupts which have real time requirements can be set up
+ * to avoid softirq processing in the thread handler. This is
+ * safe as these interrupts do not raise soft interrupts.
+ */
+ if (irq_settings_no_softirq_call(desc))
+ _local_bh_enable();
+ else
+ local_bh_enable();
return ret;
}
@@ -1040,6 +1048,9 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
irqd_set(&desc->irq_data, IRQD_NO_BALANCING);
}
+ if (new->flags & IRQF_NO_SOFTIRQ_CALL)
+ irq_settings_set_no_softirq_call(desc);
+
/* Set default affinity mask once everything is setup */
setup_affinity(irq, desc, mask);