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authorAnup Patel <apatel@ventanamicro.com>2022-04-20 16:54:08 +0530
committerPalmer Dabbelt <palmer@rivosinc.com>2022-10-04 13:16:44 -0700
commite623715f3d67ad10985b2c10cf7edd9ad85db372 (patch)
tree2b392ef105748c2d5736e1c22817a49801494ef7 /arch
parentcfadbb9df8c4dc917787da4458327e5ec14743d4 (diff)
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/riscv/Kconfig9
1 files changed, 6 insertions, 3 deletions
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index d557cc50295d..f06ce10a589b 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -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"