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Date:   Sat, 22 Aug 2020 02:43:08 +0200
From:   Thomas Gleixner <>
To:     Nick Desaulniers <>,
        Arvind Sankar <>
Cc:     "Paul E. McKenney" <>,
        Ingo Molnar <>, Arnd Bergmann <>,
        Borislav Petkov <>,
        "maintainer\:X86 ARCHITECTURE \(32-BIT AND 64-BIT\)" <>,
        "H. Peter Anvin" <>,
        "Kirill A. Shutemov" <>,
        Zhenzhong Duan <>,
        Kees Cook <>,
        Peter Zijlstra <>,
        Juergen Gross <>,
        Andy Lutomirski <>,
        Andrew Cooper <>,
        LKML <>,
        clang-built-linux <>,
        Will Deacon <>,
        Linus Torvalds <>
Subject: Re: [PATCH] x86: work around clang IAS bug referencing __force_order

On Fri, Aug 21 2020 at 16:16, Nick Desaulniers wrote:
> On Fri, Aug 21, 2020 at 4:04 PM Arvind Sankar <> wrote:
>> On Fri, Aug 21, 2020 at 02:37:48AM +0200, Thomas Gleixner wrote:
>> The gcc bug I linked to earlier is only fixed in gcc-6 onwards. Is that
> (based on
>> good enough to remove force_order? I can test gcc-4.9 and gcc-5 to check
>> if it would currently have any impact.

And that test tells you what exactly? That your particular build of
those compilers does not have the problem. A truly scientific approach.

> I think checking the disassemblies with a pre-gcc-6 would be good
> enough then; that bug isn't specific to this particular case.

What? I clearly want a statement from the GCC people that this won't
happen on pre gcc6 compilers and not just some 'works for me' statement
based on a randomly picked compiler build.



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