[PATCH] include: sbi_platform: Increase default stack size

[Aurelien Jarno]

On 2026-05-24 13:53, Vivian Wang 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>
> ---
>  include/sbi/sbi_platform.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Tested-by: Aurelien Jarno <aurelien at aurel32.net>

I can confirm that this fix is required to boot a 7.1-rc6 kernel on a 
CPU with vector instructions (in my case SpacemiT K1).

Regards
Aurelien

-- 
Aurelien Jarno                          GPG: 4096R/1DDD8C9B
aurelien at aurel32.net                     http://aurel32.net