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| author | Michal Simek <monstr@monstr.eu> | 2011-12-09 10:45:20 +0100 |
|---|---|---|
| committer | Michal Simek <monstr@monstr.eu> | 2012-01-05 08:29:13 +0100 |
| commit | 6c7a2676f594ca9a30203b4fd5dc26b53682cffe (patch) | |
| tree | 835c600a889ef88ec8a961c88a9a5b185ba80e14 /arch/microblaze/include | |
| parent | 9d0ced0084d8ae38883cc688ace8a9a4350d6bc9 (diff) | |
| download | linux-3.10-6c7a2676f594ca9a30203b4fd5dc26b53682cffe.tar.gz linux-3.10-6c7a2676f594ca9a30203b4fd5dc26b53682cffe.tar.bz2 linux-3.10-6c7a2676f594ca9a30203b4fd5dc26b53682cffe.zip | |
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 <grant.likely@secretlab.ca>
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>
Diffstat (limited to 'arch/microblaze/include')
| -rw-r--r-- | arch/microblaze/include/asm/irq.h | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/arch/microblaze/include/asm/irq.h b/arch/microblaze/include/asm/irq.h index cc54187f3d3..b116a825de7 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 <asm-generic/irq.h> /* 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); |