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authorTian, Kevin <kevin.tian@intel.com>2011-05-06 14:43:56 +0800
committerThomas Gleixner <tglx@linutronix.de>2011-05-19 14:51:08 +0200
commit983bbf1af0664b78689612b247acb514300f62c7 (patch)
tree945ed2ef4399955e515b1bd61fc2a55ed9e4c96e /arch
parentb87ba87ca26e226b2277a2d5613ed596f408e96d (diff)
x86: Don't unmask disabled irqs when migrating them
It doesn't make sense to unconditionally unmask a disabled irq when migrating it from offlined cpu to another. If the irq triggers then it will be disabled in the interrupt handler anyway. So we can just avoid unmasking it. [ tglx: Made masking unconditional again and fixed the changelog ] Signed-off-by: Fengzhe Zhang <fengzhe.zhang@intel.com> Signed-off-by: Kevin Tian <kevin.tian@intel.com> Cc: Ian Campbell <Ian.Campbell@citrix.com> Cc: Jan Beulich <JBeulich@novell.com> Cc: "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com> Link: http://lkml.kernel.org/r/%3C625BA99ED14B2D499DC4E29D8138F1505C8ED7F7E3%40shsmsx502.ccr.corp.intel.com%3E Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kernel/irq.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index 544efe2741be..6c0802eb2f7f 100644
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -276,7 +276,8 @@ void fixup_irqs(void)
else if (!(warned++))
set_affinity = 0;
- if (!irqd_can_move_in_process_context(data) && chip->irq_unmask)
+ if (!irqd_can_move_in_process_context(data) &&
+ !irqd_irq_disabled(data) && chip->irq_unmask)
chip->irq_unmask(data);
raw_spin_unlock(&desc->lock);