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

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Message-ID: <CAD=FV=VG1DpW3YukX691P59eN=oAnDxfWvm6CjpWFg5SxUmCRA@mail.gmail.com>
Date: Thu, 29 Feb 2024 09:25:38 -0800
From: Doug Anderson <dianders@...omium.org>
To: Mark Brown <broonie@...nel.org>
Cc: Sasha Levin <sashal@...nel.org>, linux-kernel@...r.kernel.org, stable@...r.kernel.org, 
	Will Deacon <will@...nel.org>, catalin.marinas@....com, oleg@...hat.com, 
	mark.rutland@....com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH AUTOSEL 6.6 21/21] arm64/sve: Lower the maximum allocation
 for the SVE ptrace regset

Hi,

On Thu, Feb 29, 2024 at 9:13 AM Mark Brown <broonie@...nel.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