linux-kernel - [tip:x86/urgent] x86, UV: Fix target_cpus() in x2apic_uv

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Date:	Fri, 12 Mar 2010 09:54:58 GMT
From:	tip-bot for Jack Steiner <steiner@....com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	steiner@....com, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:x86/urgent] x86, UV: Fix target_cpus() in x2apic_uv_x.c

Commit-ID:  8447b360a3897bdfb0677107564d1dd9ab6e63be
Gitweb:     http://git.kernel.org/tip/8447b360a3897bdfb0677107564d1dd9ab6e63be
Author:     Jack Steiner <steiner@....com>
AuthorDate: Thu, 11 Mar 2010 12:43:29 -0600
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Fri, 12 Mar 2010 10:19:29 +0100

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>
LKML-Reference: <20100311184328.GA21433@....com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 arch/x86/kernel/apic/x2apic_uv_x.c |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c
index 21db3cb..af0ca80 100644
--- a/arch/x86/kernel/apic/x2apic_uv_x.c
+++ b/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -114,11 +114,9 @@ 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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