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powerpc: Make NR_IRQS a CONFIG option

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The irq_desc array consumes quite a lot of space, and for systems
that don't need or can't have 512 irqs it's just wasted space.

The first 16 are reserved for ISA, so the minimum of 32 is really
16 - and no one has asked for more than 512 so leave that as the
maximum.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Michael Ellerman 2009-10-13 19:44:44 +00:00 committed by Benjamin Herrenschmidt
parent d35ef90bf9
commit 551b81f26f
2 changed files with 12 additions and 2 deletions
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10
arch/powerpc/Kconfig
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@ -56,6 +56,16 @@ config IRQ_PER_CPU
bool
default y
config NR_IRQS
int "Number of virtual interrupt numbers"
range 32 512
default "512"
help
This defines the number of virtual interrupt numbers the kernel
can manage. Virtual interrupt numbers are what you see in
/proc/interrupts. If you configure your system to have too few,
drivers will fail to load or worse - handle with care.
config STACKTRACE_SUPPORT
bool
default y

4
arch/powerpc/include/asm/irq.h
View file

@ -34,8 +34,8 @@ extern atomic_t ppc_n_lost_interrupts;
*/
#define NO_IRQ_IGNORE ((unsigned int)-1)
/* Total number of virq in the platform (make it a CONFIG_* option ? */
#define NR_IRQS 512
/* Total number of virq in the platform */
#define NR_IRQS CONFIG_NR_IRQS
/* Number of irqs reserved for the legacy controller */
#define NUM_ISA_INTERRUPTS 16