Messages in this thread Patch in this message | | | Date | Thu, 10 Jul 2008 11:16:45 -0700 | From | Suresh Siddha <> | Subject | [patch 11/26] x64, x2apic/intr-remap: generic irq migration support from process context |
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Generic infrastructure for migrating the irq from the process context in the presence of CONFIG_GENERIC_PENDING_IRQ.
This will be used later for migrating irq in the presence of interrupt-remapping.
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> ---
Index: tree-x86/include/linux/irq.h =================================================================== --- tree-x86.orig/include/linux/irq.h 2008-07-10 09:51:45.000000000 -0700 +++ tree-x86/include/linux/irq.h 2008-07-10 09:52:07.000000000 -0700 @@ -62,6 +62,7 @@ #define IRQ_MOVE_PENDING 0x00200000 /* need to re-target IRQ destination */ #define IRQ_NO_BALANCING 0x00400000 /* IRQ is excluded from balancing */ #define IRQ_SPURIOUS_DISABLED 0x00800000 /* IRQ was disabled by the spurious trap */ +#define IRQ_MOVE_PCNTXT 0x01000000 /* IRQ migration from process context */ #ifdef CONFIG_IRQ_PER_CPU # define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU) Index: tree-x86/kernel/irq/manage.c =================================================================== --- tree-x86.orig/kernel/irq/manage.c 2008-07-10 09:51:45.000000000 -0700 +++ tree-x86/kernel/irq/manage.c 2008-07-10 09:52:07.000000000 -0700 @@ -89,7 +89,14 @@ set_balance_irq_affinity(irq, cpumask); #ifdef CONFIG_GENERIC_PENDING_IRQ - set_pending_irq(irq, cpumask); + if (desc->status & IRQ_MOVE_PCNTXT) { + unsigned long flags; + + spin_lock_irqsave(&desc->lock, flags); + desc->chip->set_affinity(irq, cpumask); + spin_unlock_irqrestore(&desc->lock, flags); + } else + set_pending_irq(irq, cpumask); #else desc->affinity = cpumask; desc->chip->set_affinity(irq, cpumask); --
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