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x86: Don't unmask disabled irqs when migrating them

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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>
This commit is contained in:
Tian, Kevin 2011-05-06 14:43:56 +08:00 committed by Thomas Gleixner
parent b87ba87ca2
commit 983bbf1af0
1 changed files with 2 additions and 1 deletions
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3
arch/x86/kernel/irq.c
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@ -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);