Date: Fri, 30 Jun 2017 16:30:54 +0200 (CEST)
From: Thomas Gleixner <tglx@linutronix.de>
To: Andi Kleen <ak@linux.intel.com>
cc: Yinghai Lu <yinghai@kernel.org>, Stephane Eranian <eranian@google.com>,
        "H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>, Borislav Petkov <bp@alien8.de>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Bjorn Helgaas <helgaas@kernel.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Matthew Wilcox <willy@linux.intel.com>,
        Ivan Kokshaysky <ink@jurassic.park.msu.ru>,
        "linux-tip-commits@vger.kernel.org" 
        <linux-tip-commits@vger.kernel.org>
Subject: Re: [tip:x86/platform] x86/PCI/mmcfg: Switch to ECAM config mode if
 possible
In-Reply-To: <20170630031849.GP23705@tassilo.jf.intel.com>
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References: <20170316215057.452220163@linutronix.de> <tip-b5b0f00c760b6e9673ab79b88ede2f3c7a039f74@git.kernel.org> <CAE9FiQVAqZRtMLKTtySaCiCbDicN0h=6dPXEGP1M2eAq9AiYXQ@mail.gmail.com> <20170630031849.GP23705@tassilo.jf.intel.com>
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On Thu, 29 Jun 2017, Andi Kleen wrote:
> > Would this patch actually void the commit:
> 
> Yes it does. My origina; patches were opt-in for this reason, but Thomas doesn't
> believe in historical or other people's experience.

I did not realize that particular wreckage.

> But MCFG problems were a long time ago and noone uses these systems anymore,
> so perhaps he is right.

The obvious solution to this is to force type 1 for older machines, i.e. <=
K8. Some day we should stop supporting 15+ years old crap just because we
can.

Thanks,

	tglx