Attachment 208481 Details for Bug 245535 – second patch for fixing migrating softirqs

second patch for fixing migrating softirqs

linux-2.6.21-fix-migrating-softirq-take-2.patch (text/x-patch), 1.26 KB, created by Clark Williams on 2007-09-27 14:15:59 UTC

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Creator: Clark Williams

Created: 2007-09-27 14:15:59 UTC

Size: 1.26 KB

patch

obsolete

>Index: linux-2.6.21-rt-hack/kernel/irq/manage.c
>===================================================================
>--- linux-2.6.21-rt-hack.orig/kernel/irq/manage.c
>+++ linux-2.6.21-rt-hack/kernel/irq/manage.c
>@@ -761,7 +761,17 @@ static int do_irqd(void * __desc)
> 	struct irq_desc *desc = __desc;
> 
> #ifdef CONFIG_SMP
>-	set_cpus_allowed(current, desc->affinity);
>+	cpumask_t cpus_allowed, mask;
>+	int pinned_cpu;
>+
>+	cpus_allowed = desc->affinity;
>+	/*
>+	 * Restrict it to one cpu so we avoid being migrated inside of
>+	 * do_softirq_from_hardirq()
>+	 */
>+	pinned_cpu = first_cpu(desc->affinity);
>+	mask = cpumask_of_cpu(pinned_cpu);
>+	set_cpus_allowed(current, mask);
> #endif
> 	current->flags |= PF_NOFREEZE | PF_HARDIRQ;
> 
>@@ -785,8 +795,17 @@ static int do_irqd(void * __desc)
> 		/*
> 		 * Did IRQ affinities change?
> 		 */
>-		if (!cpus_equal(current->cpus_allowed, desc->affinity))
>-			set_cpus_allowed(current, desc->affinity);
>+		if (!cpu_isset(pinned_cpu, desc->affinity)) {
>+			cpus_allowed = desc->affinity;
>+			/*
>+			 * Restrict it to one cpu so we avoid being
>+			 * migrated inside of
>+			 * do_softirq_from_hardirq()
>+			 */
>+			pinned_cpu = first_cpu(desc->affinity);
>+			mask = cpumask_of_cpu(pinned_cpu);
>+			set_cpus_allowed(current, mask);
>+		}
> #endif
> 		schedule();
> 	}

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Attachments on bug 245535: 208481 | 208491