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Date: Fri, 3 Jul 2020 15:25:23 +0200
From: Peter Zijlstra <>
To: "Paul E. McKenney" <>
Cc: Marco Elver <>,
	Nick Desaulniers <>,
	Sami Tolvanen <>,
	Masahiro Yamada <>,
	Will Deacon <>,
	Greg Kroah-Hartman <>,
	Kees Cook <>,
	clang-built-linux <>,
	Kernel Hardening <>,
	linux-arch <>,
	Linux ARM <>,
	Linux Kbuild mailing list <>,
	LKML <>,,
	"maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <>
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:
> 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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