x86, intr-remap: Avoid irq_chip mask/unmask in fixup_irqs() for intr-remapping
authorSuresh Siddha <suresh.b.siddha@intel.com>
Mon, 26 Oct 2009 22:24:32 +0000 (14:24 -0800)
committerIngo Molnar <mingo@elte.hu>
Mon, 2 Nov 2009 14:56:35 +0000 (15:56 +0100)
commit84e21493a3b28c9fefe99fe827fc0c0c101a813d
tree5e879cd8a6ed1e927eccc60a515b6006c8b915c3
parent7a7732bc0f7c46f217dbec723f25366b6285cc42
x86, intr-remap: Avoid irq_chip mask/unmask in fixup_irqs() for intr-remapping

In the presence of interrupt-remapping, irqs will be migrated in
the process context and we don't do (and there is no need to)
irq_chip mask/unmask while migrating the interrupt.

Similarly fix the fixup_irqs() that get called during cpu
offline and avoid calling irq_chip mask/unmask for irqs that are
ok to be migrated in the process context.

While we didn't observe any race condition with the existing
code, this change takes complete advantage of
interrupt-remapping in the newer generation platforms and avoids
any potential HW lockup's (that often worry Eric :)

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Acked-by: Eric W. Biederman <ebiederm@xmission.com>
Cc: garyhade@us.ibm.com
LKML-Reference: <20091026230001.661423939@sbs-t61.sc.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
arch/x86/kernel/irq.c