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RISC-V: Increase range and default value of NR_CPUS 

Currently, the range and default value of NR_CPUS is too restrictive
for high-end RISC-V systems with large number of HARTs. The latest
QEMU virt machine supports upto 512 CPUs so the current NR_CPUS is
restrictive for QEMU as well. Other major architectures (such as
ARM64, x86_64, MIPS, etc) have a much higher range and default
value of NR_CPUS.

This patch increases NR_CPUS range to 2-512 and default value to
XLEN (i.e. 32 for RV32 and 64 for RV64).

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Link: https://lore.kernel.org/r/20220420112408.155561-1-apatel@ventanamicro.com/
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Anup Patel 2022-04-20 16:54:08 +05:30 committed by Palmer Dabbelt
parent cfadbb9df8
commit e623715f3d
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1 changed files with 6 additions and 3 deletions
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arch/riscv/Kconfig
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@ -309,10 +309,13 @@ config SMP
If you don't know what to do here, say N.
config NR_CPUS
int "Maximum number of CPUs (2-32)"
range 2 32
int "Maximum number of CPUs (2-512)"
depends on SMP
default "8"
range 2 512 if !SBI_V01
range 2 32 if SBI_V01 && 32BIT
range 2 64 if SBI_V01 && 64BIT
default "32" if 32BIT
default "64" if 64BIT
config HOTPLUG_CPU
bool "Support for hot-pluggable CPUs"