linux-kernel - [PATCH] x86, UV: Fix target_cpus() in x2apic_uv

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Message-ID: <20100311184328.GA21433@sgi.com>
Date:	Thu, 11 Mar 2010 12:43:29 -0600
From:	Jack Steiner <steiner@....com>
To:	mingo@...e.hu, tglx@...utronix.de
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] x86, UV: Fix target_cpus() in x2apic_uv_x.c

target_cpu() should initially target all cpus, not just cpu 0.
Otherwise systems with lots of disks can exhaust the interrupt
vectors on cpu 0 if a large number of disks are discovered before
the irq balancer is running.

Note: UV code only...


Signed-off-by: Jack Steiner <steiner@....com>

---
 arch/x86/kernel/apic/x2apic_uv_x.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

Index: linux/arch/x86/kernel/apic/x2apic_uv_x.c
===================================================================
--- linux.orig/arch/x86/kernel/apic/x2apic_uv_x.c	2010-03-11 01:59:36.000000000 -0600
+++ linux/arch/x86/kernel/apic/x2apic_uv_x.c	2010-03-11 12:16:28.000000000 -0600
@@ -120,11 +120,9 @@ EXPORT_SYMBOL_GPL(uv_possible_blades);
 unsigned long sn_rtc_cycles_per_second;
 EXPORT_SYMBOL(sn_rtc_cycles_per_second);
 
-/* Start with all IRQs pointing to boot CPU.  IRQ balancing will shift them. */
-
 static const struct cpumask *uv_target_cpus(void)
 {
-	return cpumask_of(0);
+	return cpu_online_mask;
 }
 
 static void uv_vector_allocation_domain(int cpu, struct cpumask *retmask)
--
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