Commit-ID: 84e21493a3b28c9fefe99fe827fc0c0c101a813d Gitweb: http://git.kernel.org/tip/84e21493a3b28c9fefe99fe827fc0c0c101a813d Author: Suresh Siddha <suresh.b.siddha@xxxxxxxxx> AuthorDate: Mon, 26 Oct 2009 14:24:32 -0800 Committer: Ingo Molnar <mingo@xxxxxxx> CommitDate: Mon, 2 Nov 2009 15:56:35 +0100 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@xxxxxxxxx> Acked-by: Eric W. Biederman <ebiederm@xxxxxxxxxxxx> Cc: garyhade@xxxxxxxxxx LKML-Reference: <20091026230001.661423939@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Ingo Molnar <mingo@xxxxxxx> --- arch/x86/kernel/irq.c | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c index 3ea6655..342bcbc 100644 --- a/arch/x86/kernel/irq.c +++ b/arch/x86/kernel/irq.c @@ -310,7 +310,7 @@ void fixup_irqs(void) affinity = cpu_all_mask; } - if (desc->chip->mask) + if (!(desc->status & IRQ_MOVE_PCNTXT) && desc->chip->mask) desc->chip->mask(irq); if (desc->chip->set_affinity) @@ -318,7 +318,7 @@ void fixup_irqs(void) else if (!(warned++)) set_affinity = 0; - if (desc->chip->unmask) + if (!(desc->status & IRQ_MOVE_PCNTXT) && desc->chip->unmask) desc->chip->unmask(irq); spin_unlock(&desc->lock); -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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