[PATCH] x86, UV: Fix target_cpus() in x2apic_uv_x.c

[PATCH] x86, UV: Fix target_cpus() in x2apic_uv_x.c

[Jack Steiner]

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@sgi.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)

[tip:x86/urgent] x86, UV: Fix target_cpus() in x2apic_uv_x.c

[tip-bot for Jack Steiner]

Commit-ID:  8447b360a3897bdfb0677107564d1dd9ab6e63be
Gitweb:     http://git.kernel.org/tip/8447b360a3897bdfb0677107564d1dd9ab6e63be
Author:     Jack Steiner <steiner@sgi.com>
AuthorDate: Thu, 11 Mar 2010 12:43:29 -0600
Committer:  Ingo Molnar <mingo@elte.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@sgi.com>
LKML-Reference: <20100311184328.GA21433@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.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)