linux-kernel - Re: [tip:x86/platform] x86/PCI/mmcfg: Switch to ECAM config mode if possible

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Date:   Fri, 30 Jun 2017 16:30:54 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Andi Kleen <ak@...ux.intel.com>
cc:     Yinghai Lu <yinghai@...nel.org>,
        Stephane Eranian <eranian@...gle.com>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Borislav Petkov <bp@...en8.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Bjorn Helgaas <helgaas@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Matthew Wilcox <willy@...ux.intel.com>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        "linux-tip-commits@...r.kernel.org" 
        <linux-tip-commits@...r.kernel.org>
Subject: Re: [tip:x86/platform] x86/PCI/mmcfg: Switch to ECAM config mode if
 possible

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