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Date: Fri, 18 Oct 2019 12:00:30 -0700
From: Sami Tolvanen <>
To: Nick Desaulniers <>
Cc: Will Deacon <>, Catalin Marinas <>, 
	Steven Rostedt <>, Ard Biesheuvel <>, 
	Dave Martin <>, Kees Cook <>, 
	Laura Abbott <>, Mark Rutland <>, 
	clang-built-linux <>, 
	Kernel Hardening <>, 
	Linux ARM <>, LKML <>
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 <> wrote:
> > and remove the mention from
> > the LL/SC compiler flag override.
> was that cut/dropped from this patch?
> >
> > Link:
> ^ 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.


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