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Subject: Re: [PATCH] x86/fpu: Remove the _GPL from the kernel_fpu_begin/end()
 export
To:     Ingo Molnar <mingo@kernel.org>, Jiri Kosina <jikos@kernel.org>
Cc:     Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
        Andy Lutomirski <luto@kernel.org>,
        Greg KH <gregkh@linuxfoundation.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Rik van Riel <riel@surriel.com>,
        "H. Peter Anvin" <hpa@zytor.com>,
        "Jason A. Donenfeld" <Jason@zx2c4.com>,
        Ard Biesheuvel <ard.biesheuvel@linaro.org>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        Ingo Molnar <mingo@redhat.com>,
        Nicolai Stange <nstange@suse.de>,
        Paolo Bonzini <pbonzini@redhat.com>,
        =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= <rkrcmar@redhat.com>,
        Thomas Gleixner <tglx@linutronix.de>, x86@kernel.org,
        stable@vger.kernel.org, Jiri Kosina <jikos@jikos.cz>
References: <761345df6285930339aced868ebf8ec459091383.1556807897.git.luto@kernel.org>
 <20190502154043.gfv4iplcvzjz3mc6@linutronix.de>
 <nycvar.YFH.7.76.1905032044250.10635@cbobk.fhfr.pm>
 <20190504004747.GA107909@gmail.com>
From:   Sebastian Gottschall <s.gottschall@newmedia-net.de>
Message-ID: <2238f6ed-9338-903c-760c-6200e73b1599@newmedia-net.de>
Date:   Sat, 4 May 2019 04:28:17 +0200
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Am 04.05.2019 um 02:47 schrieb Ingo Molnar:
> * Jiri Kosina <jikos@kernel.org> wrote:
>
>> On Thu, 2 May 2019, Sebastian Andrzej Siewior wrote:
>>
>>> Please don't start this. We have everything _GPL that is used for FPU
>>> related code and only a few functions are exported because KVM needs it.
>> That's not completely true. There are a lot of static inlines out there,
>> which basically made it possible for external modules to use FPU (in some
>> way) when they had kernel_fpu_[begin|end]() available.
>>
>> I personally don't care about ZFS a tiny little bit; but in general, the
>> current situation with _GPL and non-_GPL exports is simply not nice. It's
>> not really about licensing (despite the name), it's about 'internal vs
>> external', which noone is probably able to define properly.
> But that's exactly what licensing *IS* about: the argument is that
> 'internal' interfaces are clear proof that the binary module is actually
> a derived work of the kernel.
Using fpu code in kernel space in a kernel module is a derived work of 
the kernel itself?
dont get me wrong, but this is absurd. i mean you limit the use of cpu 
instructions. the use
of cpu instructions should be free of any licensing issue. i would even 
argument you are violating
the license of the cpu ower given to the kernel by executing it, by 
restricting its use for no reason


Sebastian