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Date:   Thu, 19 Nov 2020 17:31:41 -0800
From:   Nick Desaulniers <>
To:     Alexei Starovoitov <>
Cc:     Steven Rostedt <>,
        Segher Boessenkool <>,
        Peter Zijlstra <>,
        Florian Weimer <>,
        Sami Tolvanen <>,
        Mathieu Desnoyers <>,
        linux-kernel <>,
        Matt Mullins <>,
        Ingo Molnar <>,
        Alexei Starovoitov <>,
        Daniel Borkmann <>,
        Dmitry Vyukov <>,
        Martin KaFai Lau <>,
        Song Liu <>, Yonghong Song <>,
        Andrii Nakryiko <>,
        John Fastabend <>,
        KP Singh <>,
        netdev <>, bpf <>,
        Kees Cook <>,
        Josh Poimboeuf <>,, Bill Wendling <>
Subject: Re: violating function pointer signature

On Thu, Nov 19, 2020 at 9:05 AM Alexei Starovoitov
<> wrote:
> On Thu, Nov 19, 2020 at 6:59 AM Steven Rostedt <> wrote:
> > Linux obviously
> > supports multiple architectures (more than any other OS), but it is pretty
> > stuck to gcc as a compiler (with LLVM just starting to work too).
> >
> > We are fine with being stuck to a compiler if it gives us what we want.
> I beg to disagree.
> android, chrome and others changed their kernel builds to
> "make LLVM=1" some time ago.
> It's absolutely vital for the health of the kernel to be built with
> both gcc and llvm.

Our fleet of machines in the data centers is currently mid-ramp, at
around or slightly just over 50% of kernels built with Clang.  Soon to
be 100%.  So "a good chunk of Google services," too, FWIW.

OpenMandriva is on track for their 4.2 release to use LLVM for their kernels.
~Nick Desaulniers

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