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From:   Anup Patel <apatel@ventanamicro.com>
To:     Palmer Dabbelt <palmer@dabbelt.com>,
        Paul Walmsley <paul.walmsley@sifive.com>
Cc:     Arnd Bergmann <arnd@arndb.de>, Atish Patra <atishp@atishpatra.org>,
        Alistair Francis <Alistair.Francis@wdc.com>,
        Anup Patel <anup@brainfault.org>,
        linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
        Anup Patel <apatel@ventanamicro.com>
Subject: [PATCH v2] RISC-V: Increase range and default value of NR_CPUS
Date:   Sat, 19 Mar 2022 17:42:06 +0530
Message-Id: <20220319121206.95919-1-apatel@ventanamicro.com>
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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>
---
Changes since v1:
 - Updated NR_CPUS range to 2-512 which reflects maximum number of
   CPUs supported by QEMU virt machine.
---
 arch/riscv/Kconfig | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 5adcbd9b5e88..423ac17f598c 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 (2-512)"
+	range 2 512
 	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