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From f7944ad8443b4b26741c0b1c7e5ad1721f5d094e Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Tue, 21 Jul 2009 16:07:37 +0200
Subject: [PATCH] genirq: disable random call on preempt-rt
commit 04479b1c97ac0f63350e1825f7bd12caccc77a35 in tip.
The random call introduces high latencies and is almost
unused. Disable it for -rt.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
---
kernel/irq/handle.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index e93b055..ece44f6 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -441,8 +441,11 @@ irqreturn_t handle_IRQ_event(unsigned int irq, struct irqaction *action)
action = action->next;
} while (action);
+#ifndef CONFIG_PREEMPT_RT
+ /* FIXME: Can we unbreak that ? */
if (status & IRQF_SAMPLE_RANDOM)
add_interrupt_randomness(irq);
+#endif
local_irq_disable();
return retval;
--
1.7.0.4
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