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Subject[PATCH] RISC-V: Increase range and default value of NR_CPUS
Date
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 2-256 and default value to
XLEN (i.e. 32 for RV32 and 64 for RV64).

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
---
arch/riscv/Kconfig | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 5adcbd9b5e88..54f125eb10f6 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -274,10 +274,11 @@ 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 (2-256)"
+ range 2 256
depends on SMP
- default "8"
+ default "32" if 32BIT
+ default "64" if 64BIT

config HOTPLUG_CPU
bool "Support for hot-pluggable CPUs"
--
2.25.1
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