[PATCH] include: sbi_platform: Increase default stack size

[Anirudh Srinivasan]

Hi Vivian,

On Sun, May 24, 2026 at 12:53 AM Vivian Wang <wangruikang at iscas.ac.cn> wrote:
>
> sbi_misaligned_v_ld_emulator() has a local buffer (namely mask) which is
> 8192 bytes in size, so the default stack size is not enough. Double it
> to 16384.
>
> This stack overflow can be observed by any S-mode software and leads to
> M-mode crash or unexpected behavior, as long as the S-mode software does
> not enable FWFT misaligned delegation [1]. This may be considered a
> temporary fix until further fixes are made to misaligned handling [2].
>
> Link: https://lore.kernel.org/linux-riscv/nrvt74qnojaubiwjo37ums4lnclu466hovwrhmtbag6f5uhrql@q6msoe2oto4b # [1]
> Link: https://lore.kernel.org/opensbi/20260210094044.72591-1-ganboing@gmail.com # [2]
> Signed-off-by: Vivian Wang <wangruikang at iscas.ac.cn>

There was a similar patch [1] from few days ago that makes this a
Kconfig option. Either option would work to fix the bug I encountered.

Wondering what the maintainers think about how to proceed with this.

[1] https://lore.kernel.org/opensbi/VI0P192MB3062735A6194BB6DA72083499E002@VI0P192MB3062.EURP192.PROD.OUTLOOK.COM/T/#u

Regards
Anirudh Srinivasan