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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