Commit 551b81f2 authored by Michael Ellerman's avatar Michael Ellerman Committed by Benjamin Herrenschmidt

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
...@@ -56,6 +56,16 @@ config IRQ_PER_CPU ...@@ -56,6 +56,16 @@ config IRQ_PER_CPU
bool bool
default y 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 config STACKTRACE_SUPPORT
bool bool
default y default y
......
...@@ -34,8 +34,8 @@ extern atomic_t ppc_n_lost_interrupts; ...@@ -34,8 +34,8 @@ extern atomic_t ppc_n_lost_interrupts;
*/ */
#define NO_IRQ_IGNORE ((unsigned int)-1) #define NO_IRQ_IGNORE ((unsigned int)-1)
/* Total number of virq in the platform (make it a CONFIG_* option ? */ /* Total number of virq in the platform */
#define NR_IRQS 512 #define NR_IRQS CONFIG_NR_IRQS
/* Number of irqs reserved for the legacy controller */ /* Number of irqs reserved for the legacy controller */
#define NUM_ISA_INTERRUPTS 16 #define NUM_ISA_INTERRUPTS 16
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment