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Date: Fri, 18 Oct 2019 12:00:30 -0700
From: Sami Tolvanen <samitolvanen@...gle.com>
To: Nick Desaulniers <ndesaulniers@...gle.com>
Cc: Will Deacon <will@...nel.org>, Catalin Marinas <catalin.marinas@....com>,
Steven Rostedt <rostedt@...dmis.org>, Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Dave Martin <Dave.Martin@....com>, Kees Cook <keescook@...omium.org>,
Laura Abbott <labbott@...hat.com>, Mark Rutland <mark.rutland@....com>,
clang-built-linux <clang-built-linux@...glegroups.com>,
Kernel Hardening <kernel-hardening@...ts.openwall.com>,
Linux ARM <linux-arm-kernel@...ts.infradead.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 05/18] arm64: kbuild: reserve reg x18 from general
allocation by the compiler
On Fri, Oct 18, 2019 at 10:32 AM 'Nick Desaulniers' via Clang Built
Linux <clang-built-linux@...glegroups.com> wrote:
> > and remove the mention from
> > the LL/SC compiler flag override.
>
> was that cut/dropped from this patch?
>
> >
> > Link: https://patchwork.kernel.org/patch/9836881/
>
> ^ Looks like it. Maybe it doesn't matter, but if sending a V2, maybe
> the commit message to be updated?
True. The original patch is from 2017 and the relevant part of
arm64/lib/Makefile no longer exists. I'll update this accordingly.
> I like how this does not conditionally reserve it based on the CONFIG
> for SCS. Hopefully later patches don't wrap it, but I haven't looked
> through all of them yet.
In a later patch x18 is only reserved with SCS. I'm fine with dropping
that patch and reserving it always, but wouldn't mind hearing thoughts
from the maintainers about this first.
Sami
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