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

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Message-ID: <20171212134952.2hok6754245qshv3@hirez.programming.kicks-ass.net>
Date:   Tue, 12 Dec 2017 14:49:52 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     linux-kernel@...r.kernel.org, ppaalanen@...il.com,
        lyude@...hat.com, rostedt@...dmis.org, mingo@...nel.org,
        tglx@...utronix.de, kherbst@...hat.com,
        torvalds@...ux-foundation.org, hpa@...or.com
Cc:     linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/urgent] x86/mm/kmmio: Fix mmiotrace for page unaligned
 addresses

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?