Re: [PATCH v2 5/5] lib/cpumask: add FORCE_NR_CPUS config option

[Geert Uytterhoeven]

Hi Andreas,

On Tue, Oct 18, 2022 at 3:41 PM Andreas Schwab <schwab@xxxxxxx> wrote:
> On Okt 18 2022, Geert Uytterhoeven wrote:
> > Moreover, this cannot be used on all systems.  E.g. on Icicle Kit with
> > Microchip PolarFire SoC, CONFIG_NR_CPUS needs to be larger than 4,
> > as the system has actually 5 CPU cores (1xE51 and 4xU54), but Linux
> > runs only on 4 of them.  So you cannot use FORCE_NR_CPUS=y.
>
> But does Linux acually see the E51 core?  On the Hifive boards it is
> disabled in the device tree, and the cpu probing just skips it,
> effectively resulting in only four cpus.

The E51 is indeed disabled in DT.
The CPU parts of arch/riscv/boot/dts/sifive/fu540-c000.dtsi and
arch/riscv/boot/dts/microchip/mpfs.dtsi arre very similar.
Do you get 4 CPUs on Hifive with CONFIG_NR_CPUS=4?

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds