30 lines
834 B
Diff
30 lines
834 B
Diff
From: Thomas Gleixner <tglx@linutronix.de>
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Date: Tue, 21 Jul 2009 16:07:37 +0200
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Subject: genirq: Disable random call on preempt-rt
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The random call introduces high latencies and is almost
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unused. Disable it for -rt.
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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---
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kernel/irq/handle.c | 3 +++
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1 file changed, 3 insertions(+)
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Index: linux-3.2/kernel/irq/handle.c
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===================================================================
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--- linux-3.2.orig/kernel/irq/handle.c
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+++ linux-3.2/kernel/irq/handle.c
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@@ -156,8 +156,11 @@ handle_irq_event_percpu(struct irq_desc
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action = action->next;
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} while (action);
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+#ifndef CONFIG_PREEMPT_RT_FULL
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+ /* FIXME: Can we unbreak that ? */
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if (random & IRQF_SAMPLE_RANDOM)
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add_interrupt_randomness(irq);
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+#endif
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if (!noirqdebug)
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note_interrupt(irq, desc, retval);
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