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authorMax Krasnyansky <maxk@qualcomm.com>2008-05-29 11:02:52 -0700
committerThomas Gleixner <tglx@linutronix.de>2008-06-05 15:18:30 +0200
commit18404756765c713a0be4eb1082920c04822ce588 (patch)
treeed426f8fe90bff1ffd854074a2e4b370dd6821f8 /arch/alpha
parentc3b25b32e8bef526cca748e1ba023c6bdd705a99 (diff)
downloadlinux-18404756765c713a0be4eb1082920c04822ce588.tar.bz2
genirq: Expose default irq affinity mask (take 3)
Current IRQ affinity interface does not provide a way to set affinity for the IRQs that will be allocated/activated in the future. This patch creates /proc/irq/default_smp_affinity that lets users set default affinity mask for the newly allocated IRQs. Changing the default does not affect affinity masks for the currently active IRQs, they have to be changed explicitly. Updated based on Paul J's comments and added some more documentation. Signed-off-by: Max Krasnyansky <maxk@qualcomm.com> Cc: pj@sgi.com Cc: a.p.zijlstra@chello.nl Cc: tglx@linutronix.de Cc: rdunlap@xenotime.net Cc: mingo@elte.hu Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/alpha')
-rw-r--r--arch/alpha/kernel/irq.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/arch/alpha/kernel/irq.c b/arch/alpha/kernel/irq.c
index facf82a5499a..c626a821cdcb 100644
--- a/arch/alpha/kernel/irq.c
+++ b/arch/alpha/kernel/irq.c
@@ -42,8 +42,7 @@ void ack_bad_irq(unsigned int irq)
#ifdef CONFIG_SMP
static char irq_user_affinity[NR_IRQS];
-int
-select_smp_affinity(unsigned int irq)
+int irq_select_affinity(unsigned int irq)
{
static int last_cpu;
int cpu = last_cpu + 1;
@@ -51,7 +50,7 @@ select_smp_affinity(unsigned int irq)
if (!irq_desc[irq].chip->set_affinity || irq_user_affinity[irq])
return 1;
- while (!cpu_possible(cpu))
+ while (!cpu_possible(cpu) || !cpu_isset(cpu, irq_default_affinity))
cpu = (cpu < (NR_CPUS-1) ? cpu + 1 : 0);
last_cpu = cpu;