linux-kernel - Re: [tip:x86/urgent] x86/mm/kmmio: Fix mmiotrace for page unaligned addresses

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Date:   Tue, 12 Dec 2017 15:04:18 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     linux-kernel@...r.kernel.org, ppaalanen@...il.com,
        lyude@...hat.com, rostedt@...dmis.org, tglx@...utronix.de,
        kherbst@...hat.com, torvalds@...ux-foundation.org, hpa@...or.com,
        linux-tip-commits@...r.kernel.org,
        Karol Herbst <karolherbst@...il.com>
Subject: Re: [tip:x86/urgent] x86/mm/kmmio: Fix mmiotrace for page unaligned
 addresses


* Peter Zijlstra <peterz@...radead.org> wrote:

> On Tue, Dec 12, 2017 at 02:55:30AM -0800, tip-bot for Karol Herbst wrote:
> > Commit-ID:  6d60ce384d1d5ca32b595244db4077a419acc687
> > Gitweb:     https://git.kernel.org/tip/6d60ce384d1d5ca32b595244db4077a419acc687
> > Author:     Karol Herbst <kherbst@...hat.com>
> > AuthorDate: Mon, 27 Nov 2017 08:51:39 +0100
> > Committer:  Ingo Molnar <mingo@...nel.org>
> > CommitDate: Mon, 11 Dec 2017 15:35:18 +0100
> > 
> > x86/mm/kmmio: Fix mmiotrace for page unaligned addresses
> 
> OK, let me hijack this thread since apparently people use and care about
> mmiotrace.
> 
> I was recently auditing the x86 tlb flushing and ran across this
> 'thing'. Can someone please explain to me how this is supposed to work
> and how its not completely broken?

(I have Cc:-ed other gents as well.)

Thanks,

	Ingo