Re: [PATCH V4 8/8] riscv: Add config of thread stack size

[Arnd Bergmann]

On Tue, Sep 20, 2022, at 2:46 AM, Guo Ren wrote:

> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index dfe600f3526c..8def456f328c 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -442,6 +442,16 @@ config IRQ_STACKS
>           Add independent irq & softirq stacks for percpu to prevent
> kernel stack
>           overflows. We may save some memory footprint by disabling IRQ_STACKS.
>
> +config THREAD_SIZE
> +       int "Kernel stack size (in bytes)" if EXPERT
> +       range 4096 65536
> +       default 8192 if 32BIT && !KASAN
> +       default 32768 if 64BIT && KASAN
> +       default 16384
> +       help
> +         Specify the Pages of thread stack size (from 4KB to 64KB), which also
> +         affects irq stack size, which is equal to thread stack size.

I still think this should be guarded in a way that prevents
setting the stack to smaller than default values unless VMAP_STACK
is set as well.

    Arnd