Commit-ID: 47a06d3a783217acae02976f15ca07ddc1ac024f Gitweb: http://git.kernel.org/tip/47a06d3a783217acae02976f15ca07ddc1ac024f Author: Thomas Gleixner <t...@linutronix.de> AuthorDate: Tue, 20 Jun 2017 01:37:30 +0200 Committer: Thomas Gleixner <t...@linutronix.de> CommitDate: Thu, 22 Jun 2017 18:21:17 +0200
genirq/cpuhotplug: Add support for conditional masking Interrupts which cannot be migrated in process context, need to be masked before the affinity is changed forcefully. Add support for that. Will be compiled out for architectures which do not have this x86 specific issue. Signed-off-by: Thomas Gleixner <t...@linutronix.de> Cc: Jens Axboe <ax...@kernel.dk> Cc: Marc Zyngier <marc.zyng...@arm.com> Cc: Michael Ellerman <m...@ellerman.id.au> Cc: Keith Busch <keith.bu...@intel.com> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Christoph Hellwig <h...@lst.de> Link: http://lkml.kernel.org/r/20170619235445.604565...@linutronix.de --- kernel/irq/cpuhotplug.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/kernel/irq/cpuhotplug.c b/kernel/irq/cpuhotplug.c index 4be4bd6..6f46587 100644 --- a/kernel/irq/cpuhotplug.c +++ b/kernel/irq/cpuhotplug.c @@ -18,6 +18,7 @@ static bool migrate_one_irq(struct irq_desc *desc) { struct irq_data *d = irq_desc_get_irq_data(desc); struct irq_chip *chip = irq_data_get_irq_chip(d); + bool maskchip = !irq_can_move_pcntxt(d) && !irqd_irq_masked(d); const struct cpumask *affinity; bool brokeaff = false; int err; @@ -69,6 +70,10 @@ static bool migrate_one_irq(struct irq_desc *desc) if (irq_fixup_move_pending(desc, true)) affinity = irq_desc_get_pending_mask(desc); + /* Mask the chip for interrupts which cannot move in process context */ + if (maskchip && chip->irq_mask) + chip->irq_mask(d); + if (cpumask_any_and(affinity, cpu_online_mask) >= nr_cpu_ids) { affinity = cpu_online_mask; brokeaff = true; @@ -78,8 +83,12 @@ static bool migrate_one_irq(struct irq_desc *desc) if (err) { pr_warn_ratelimited("IRQ%u: set affinity failed(%d).\n", d->irq, err); - return false; + brokeaff = false; } + + if (maskchip && chip->irq_unmask) + chip->irq_unmask(d); + return brokeaff; }
