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Commit 551b81f2 authored by Michael Ellerman's avatar Michael Ellerman Committed by Benjamin Herrenschmidt
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powerpc: Make NR_IRQS a CONFIG option 



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: default avatarMichael Ellerman <michael@ellerman.id.au>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent d35ef90b

arch/powerpc/Kconfig

+10 −0
Original line number Diff line number Diff line
@@ -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

arch/powerpc/include/asm/irq.h

+2 −2
Original line number Diff line number Diff line
@@ -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