linux-kernel - Re: [tip:x86/seves] BUILD SUCCESS WITH WARNING e6eb15c9ba3165698488ae5c34920eea20eaa38e

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Date:   Tue, 15 Sep 2020 17:50:54 -0400
From:   Arvind Sankar <nivedita@...m.mit.edu>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Rong Chen <rong.a.chen@...el.com>,
        kernel test robot <lkp@...el.com>,
        "Li, Philip" <philip.li@...el.com>, x86-ml <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Marco Elver <elver@...gle.com>
Subject: Re: [tip:x86/seves] BUILD SUCCESS WITH WARNING
 e6eb15c9ba3165698488ae5c34920eea20eaa38e

On Tue, Sep 15, 2020 at 10:49:12PM +0200, Borislav Petkov wrote:
> 
> (Btw, clang doesn't need to add that "xor %eax,%eax" - panic() should not be
>  returning, ever. :-))
> 

I think this is because panic() is varargs, and clang doesn't support
gcc's -mskip-rax-setup. The normal ABI requires the caller to set RAX to
the number of arguments in vector registers.

https://patchwork.ozlabs.org/project/gcc/patch/20141218131150.GA32638@intel.com/