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arm64: defconfig: increase NR_CPUS default to 64 

Raising the current maximum limit to 64. This is needed for Cavium's
Thunder systems that will have at least 48 cores per die.

The change keeps the current memory footprint in cpu mask structures.
It does not break existing code. Setting the maximum to 64 cpus still
boots systems with less cpus.

Mark's Juno happily booted with a NR_CPUS=64 kernel.

Tested on our Thunder system with 48 cores. We could see interrupts to
all cores.

Cc: Radha Mohan Chintakuntla <rchintakuntla@cavium.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Robert Richter <rrichter@cavium.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
hifive-unleashed-5.1
Robert Richter 2014-09-08 12:44:48 +01:00 committed by Will Deacon
parent e54bcde3d6
commit e3672649fa
1 changed files with 3 additions and 3 deletions
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arch/arm64/Kconfig
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@ -253,11 +253,11 @@ config SCHED_SMT
places. If unsure say N here.
config NR_CPUS
int "Maximum number of CPUs (2-32)"
range 2 32
int "Maximum number of CPUs (2-64)"
range 2 64
depends on SMP
# These have to remain sorted largest to smallest
default "8"
default "64"
config HOTPLUG_CPU
bool "Support for hot-pluggable CPUs"