linux-kernel - Re: [PATCH 0/4] x86/mm/cpa: Fix cpa-array TLB invalidation

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Message-ID: <20181130180619.GC11614@hirez.programming.kicks-ass.net>
Date:   Fri, 30 Nov 2018 19:06:19 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     "StDenis, Tom" <Tom.StDenis@....com>
Cc:     "Koenig, Christian" <Christian.Koenig@....com>,
        "dave.hansen@...el.com" <dave.hansen@...el.com>,
        "luto@...nel.org" <luto@...nel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Deucher, Alexander" <Alexander.Deucher@....com>
Subject: Re: [PATCH 0/4] x86/mm/cpa: Fix cpa-array TLB invalidation

On Fri, Nov 30, 2018 at 05:49:34PM +0000, StDenis, Tom wrote:
> On 2018-11-30 12:48 p.m., Peter Zijlstra wrote:
> > On Fri, Nov 30, 2018 at 04:19:46PM +0000, StDenis, Tom wrote:
> >> On 2018-11-30 10:31 a.m., Peter Zijlstra wrote:
> > 
> >>> I pushed them out to:
> >>>
> >>>     git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git x86/mm
> >>>
> >>> I hope that works; I'm out for a few hours, but should check on email
> >>> again tonight.
> >>>
> >>
> >> NAK I get a failure in TTM on init with your x86/mm branch (see attached
> >> dmesg).
> > 
> > *sigh*, it's been one of those days. Ok, I'll go write some cpa
> > selftests or something so that I have code that uses this stuff.
> > 
> 
> Well the ttm crash could be completely unrelated the problem is your 
> x86/mm branch is not up to date with master and doesn't include drm fixes.

Well, it crashes right in the middle of the CPA code, and I'm having a
horrible day, so I'm thinking I screwed up rather than anything else.

Also, some level of selftests would be good to have in any case I
figure.