riscv: stack: Add config of thread stack size
The commit 0cac21b0 ("riscv: use 16KB kernel stack on 64-bit") increases the thread size mandatory, but some scenarios, such as D1 with a small memory footprint, would suffer from that. After independent irq stack support, let's give users a choice to determine their custom stack size. Link: https://lore.kernel.org/linux-riscv/5f6e6c39-b846-4392-b468-02202404de28@www.fastmail.com/Suggested-by: Arnd Bergmann <arnd@arndb.de> Tested-by: Jisheng Zhang <jszhang@kernel.org> Signed-off-by: Guo Ren <guoren@linux.alibaba.com> Signed-off-by: Guo Ren <guoren@kernel.org> Link: https://lore.kernel.org/r/20230614013018.2168426-4-guoren@kernel.orgSigned-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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