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Date: Tue, 12 May 2015 11:24:12 -0700
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Linus Torvalds <torvalds@linux-foundation.org>,
        Ingo Molnar <mingo@kernel.org>
CC: Alex Henrie <alexhenrie24@gmail.com>,
        One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>,
        Kees Cook <keescook@chromium.org>, Doug Johnson <dougvj@gmail.com>,
        Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>,
        Tyler Hicks <tyhicks@canonical.com>, Al Viro <viro@zeniv.linux.org.uk>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Andy Lutomirski <luto@kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Borislav Petkov <bp@alien8.de>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Arjan van de Ven <arjan@infradead.org>,
        Denys Vlasenko <dvlasenk@redhat.com>, Brian Gerst <brgerst@gmail.com>
Subject: Re: [PATCH v2] x86: Preserve iopl on fork and execve
References: <1431387505-13410-1-git-send-email-alexhenrie24@gmail.com>	<20150512064032.GA25097@gmail.com> <CA+55aFx3RswnjmCErk8QhCo0KrCvxZnuES3WALBR1NkPbUZ8qw@mail.gmail.com>
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On 05/12/2015 08:13 AM, Linus Torvalds wrote:
> On Mon, May 11, 2015 at 11:40 PM, Ingo Molnar <mingo@kernel.org> wrote:
>>
>>  - Nothing actually broke that people cared about in the last 2.5
>>    years, thus this might be one of the (very very rare) cases where
>>    preserving a breakage is the right thing to do.
> 
> Indeed. The Linux "no regressions" rule is not about some theoretical
> "the ABI changed". It's about actual observed regressions.
> 
> So if we can improve the ABI without any user program or workflow
> breaking, that's fine.
> 

But Linus, that would break dominix... ;)

	-hpa