From 6c7a2676f594ca9a30203b4fd5dc26b53682cffe Mon Sep 17 00:00:00 2001 From: Michal Simek Date: Fri, 9 Dec 2011 10:45:20 +0100 Subject: microblaze: Change NO_IRQ to 0 As has been discussed many times[1], Using NO_IRQ set to anything other than 0 is bug waiting to happen since many drivers follow the pattern "if (!irq)" for testing whether or not an irq has been set. This patch changes the Microblaze NO_IRQ setting from -1 to 0 to bring it in line with most of the rest of the kernel. It also prepares for Microblaze eventually supporting multiple interrupt controllers by breaking the assumption that hwirq# == Linux IRQ#. The Linux IRQ number is just a cookie with no guarantee of a direct relationship with the hardware irq arrangement. At this point, Microblaze interrupt handling only supports only one instance of one kind of interrupt controller (xilinx_intc). This change shouldn't affect any architecture code outside of the interrupt controller driver and the irq_of mapping. Updated to 3.2 and to use irq_data.hwirq by Rob Herring. Tested and fixed by Michal Simek. [1] http://lkml.org/lkml/2005/11/21/221 Signed-off-by: Grant Likely Signed-off-by: Rob Herring Signed-off-by: Michal Simek --- arch/microblaze/include/asm/irq.h | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) (limited to 'arch/microblaze/include/asm/irq.h') diff --git a/arch/microblaze/include/asm/irq.h b/arch/microblaze/include/asm/irq.h index cc54187f3d38..b116a825de77 100644 --- a/arch/microblaze/include/asm/irq.h +++ b/arch/microblaze/include/asm/irq.h @@ -9,7 +9,14 @@ #ifndef _ASM_MICROBLAZE_IRQ_H #define _ASM_MICROBLAZE_IRQ_H -#define NR_IRQS 32 + +/* + * Linux IRQ# is currently offset by one to map to the hardware + * irq number. So hardware IRQ0 maps to Linux irq 1. + */ +#define NO_IRQ_OFFSET 1 +#define IRQ_OFFSET NO_IRQ_OFFSET +#define NR_IRQS (32 + IRQ_OFFSET) #include /* This type is the placeholder for a hardware interrupt number. It has to @@ -20,7 +27,7 @@ typedef unsigned long irq_hw_number_t; extern unsigned int nr_irq; -#define NO_IRQ (-1) +#define NO_IRQ 0 struct pt_regs; extern void do_IRQ(struct pt_regs *regs); -- cgit v1.2.3-73-gaa49b