Re: [PATCH AUTOSEL 6.6 21/21] arm64/sve: Lower the maximum allocation for the SVE ptrace regset

Doug Anderson
2024-02-29T17:25:58Z

Hi,

On Thu, Feb 29, 2024 at 9:13 AM Mark Brown <broonie@kernel.org> wrote:
>
> On Thu, Feb 29, 2024 at 08:51:09AM -0800, Doug Anderson wrote:
>
> > As I mentioned [1], there's a hidden dependency here and without it
> > the patch doesn't actually do anything useful in kernel 6.6 nor kernel
> > 6.1. Maybe the right answer is to backport this with the hardcoded
> > value of "16" for those older kernels? Maybe Mark has a better
> > suggestion?
>
> Your suggestion should be fine.

Crud. Ignore me. The patch is fine as-is for 6.1, 6.6, and 6.7. :(

git tag --contains f171f9e4097d
...shows that the needed patch is actually in 5.19+

Instead of using the above "git tag --contains", I was naively just running:

git grep ZCR_ELx_LEN_SIZE

...and I saw that it still came back 9 on v6.6. ...but that's because
it was still set as 9 in the tools directory and I didn't notice.

Sorry for the noise. We could still do the hardcoded solution of
defining it as 16 for 5.15 and older if folks want.

-Doug