4.3-stable review patch. If anyone has any objections, please let me know.
------------------ From: Boris Ostrovsky <[email protected]> commit b4ff8389ed14b849354b59ce9b360bdefcdbf99c upstream. After commit 8c058b0b9c34 ("x86/irq: Probe for PIC presence before allocating descs for legacy IRQs") early_irq_init() will no longer preallocate descriptors for legacy interrupts if PIC does not exist, which is the case for Xen PV guests. Therefore we may need to allocate those descriptors ourselves. Signed-off-by: Boris Ostrovsky <[email protected]> Suggested-by: Thomas Gleixner <[email protected]> Signed-off-by: David Vrabel <[email protected]> Cc: Vitaly Kuznetsov <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- arch/arm/include/asm/irq.h | 5 +++++ arch/arm64/include/asm/irq.h | 5 +++++ drivers/xen/events/events_base.c | 5 +++-- 3 files changed, 13 insertions(+), 2 deletions(-) --- a/arch/arm/include/asm/irq.h +++ b/arch/arm/include/asm/irq.h @@ -40,6 +40,11 @@ extern void arch_trigger_all_cpu_backtra #define arch_trigger_all_cpu_backtrace(x) arch_trigger_all_cpu_backtrace(x) #endif +static inline int nr_legacy_irqs(void) +{ + return NR_IRQS_LEGACY; +} + #endif #endif --- a/arch/arm64/include/asm/irq.h +++ b/arch/arm64/include/asm/irq.h @@ -21,4 +21,9 @@ static inline void acpi_irq_init(void) } #define acpi_irq_init acpi_irq_init +static inline int nr_legacy_irqs(void) +{ + return 0; +} + #endif --- a/drivers/xen/events/events_base.c +++ b/drivers/xen/events/events_base.c @@ -39,6 +39,7 @@ #include <asm/irq.h> #include <asm/idle.h> #include <asm/io_apic.h> +#include <asm/i8259.h> #include <asm/xen/pci.h> #include <xen/page.h> #endif @@ -420,7 +421,7 @@ static int __must_check xen_allocate_irq return xen_allocate_irq_dynamic(); /* Legacy IRQ descriptors are already allocated by the arch. */ - if (gsi < NR_IRQS_LEGACY) + if (gsi < nr_legacy_irqs()) irq = gsi; else irq = irq_alloc_desc_at(gsi, -1); @@ -446,7 +447,7 @@ static void xen_free_irq(unsigned irq) kfree(info); /* Legacy IRQ descriptors are managed by the arch. */ - if (irq < NR_IRQS_LEGACY) + if (irq < nr_legacy_irqs()) return; irq_free_desc(irq); -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
