linux-kernel - Re: [PATCH v2 0/6] arm64/signal: Signal handling cleanups

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Message-ID: <Y9kUGGYpWvbb1fZC@sirena.org.uk>
Date:   Tue, 31 Jan 2023 13:14:00 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Catalin Marinas <catalin.marinas@....com>
Cc:     Will Deacon <will@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/6] arm64/signal: Signal handling cleanups

On Tue, Jan 31, 2023 at 12:51:33PM +0000, Catalin Marinas wrote:
> On Tue, Jan 03, 2023 at 08:25:15PM +0000, Mark Brown wrote:

> >       arm64/signal: Avoid rereading context frame sizes
> >       arm64/signal: Only read new data when parsing the SVE context
> >       arm64/signal: Only read new data when parsing the ZA context

> I'm not sure these add much to the code readability (and the performance
> improvement I guess is negligible). We avoid some copy_from_user() into
> the context structures but rely on data read previously or some
> get_user() into local variables. Personally I'd make the
> restore_fpsimd_context() also do a copy_from_user() for consistency with
> the current sve and za frames restoring.

> Personal preference, not sure whether Will has the same view.

I don't particularly care about those changs either, Will seemed to be
asking for something like that.

Note that I should at some point today send a version of this series
rebased on for-next/core due to the TPIDR2 and SME2 changes.

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