linux-kernel - Re: AMD DC graphics display code enables -mhard-float, -msse, -msse2 without any visible FPU state protection

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Message-ID: <20200415091620.GY20730@hirez.programming.kicks-ass.net>
Date:   Wed, 15 Apr 2020 11:16:20 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Christian König <christian.koenig@....com>
Cc:     Jann Horn <jannh@...gle.com>,
        Harry Wentland <harry.wentland@....com>,
        Leo Li <sunpeng.li@....com>, amd-gfx@...ts.freedesktop.org,
        Alex Deucher <alexander.deucher@....com>,
        "David (ChunMing) Zhou" <David1.Zhou@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        the arch/x86 maintainers <x86@...nel.org>,
        kernel list <linux-kernel@...r.kernel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        mhiramat@...nel.org
Subject: Re: AMD DC graphics display code enables -mhard-float, -msse, -msse2
 without any visible FPU state protection

On Fri, Apr 10, 2020 at 04:31:39PM +0200, Christian König wrote:
> Can we put this new automated check will be behind a configuration flag
> initially? Or at least make it a warning and not a hard error.

I'll try and get the patches merged in mainline objtool but with a flag
that isn't used by default.