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