Messages in this thread | | | From | Atish Patra <> | Date | Thu, 18 Aug 2022 14:29:03 -0700 | Subject | Re: [PATCH v3] RISC-V: Increase range and default value of NR_CPUS |
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On Tue, May 24, 2022 at 5:08 AM Anup Patel <anup@brainfault.org> wrote: > > Hi Palmer, > > On Wed, Apr 20, 2022 at 4:54 PM Anup Patel <apatel@ventanamicro.com> wrote: > > > > 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> > > Can this PATCH be considered for 5.19 ? > > Thanks, > Anup > > > --- > > Changes since v2: > > - Rebased on Linux-5.18-rc3 > > - Use a different range when SBI v0.1 is enabled > > Changes since v1: > > - Updated NR_CPUS range to 2-512 which reflects maximum number of > > CPUs supported by QEMU virt machine. > > --- > > arch/riscv/Kconfig | 9 ++++++--- > > 1 file changed, 6 insertions(+), 3 deletions(-) > > > > diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig > > index 00fd9c548f26..1823f281069f 100644 > > --- a/arch/riscv/Kconfig > > +++ b/arch/riscv/Kconfig > > @@ -275,10 +275,13 @@ 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" > > -- > > 2.25.1 > >
Ping ? It would be useful to include this patch sooner than later to enable high HART count testing by default.
-- Regards, Atish
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