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Date: Fri, 3 Jul 2020 15:25:23 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: "Paul E. McKenney" <paulmck@...nel.org>
Cc: Marco Elver <elver@...gle.com>,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	Sami Tolvanen <samitolvanen@...gle.com>,
	Masahiro Yamada <masahiroy@...nel.org>,
	Will Deacon <will@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Kees Cook <keescook@...omium.org>,
	clang-built-linux <clang-built-linux@...glegroups.com>,
	Kernel Hardening <kernel-hardening@...ts.openwall.com>,
	linux-arch <linux-arch@...r.kernel.org>,
	Linux ARM <linux-arm-kernel@...ts.infradead.org>,
	Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>, linux-pci@...r.kernel.org,
	"maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>
Subject: Re: [PATCH 00/22] add support for Clang LTO

On Fri, Jul 03, 2020 at 03:13:30PM +0200, Peter Zijlstra wrote:
> > The prototype for GCC is here: https://github.com/AKG001/gcc/
> 
> Thanks! Those test cases are somewhat over qualified though:
> 
>        static volatile _Atomic (TYPE) * _Dependent_ptr a;     		\

One question though; since its a qualifier, and we've recently spend a
whole lot of effort to strip qualifiers in say READ_ONCE(), how does,
and how do we want, this qualifier to behave.

C++ has very convenient means of manipulating qualifiers, so it's not
much of a problem there, but for C it is, as we've found, really quite
cumbersome. Even with _Generic() we can't manipulate individual
qualifiers afaict.

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