linux-kernel - Re: [RFC PATCH 0/7] Early task context tracking

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Date:   Thu, 4 Apr 2019 11:42:26 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     Daniel Bristot de Oliveira <bristot@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Tommaso Cucinotta <tommaso.cucinotta@...tannapisa.it>,
        Romulo Silva de Oliveira <romulo.deoliveira@...c.br>,
        Clark Williams <williams@...hat.com>, X86 ML <x86@...nel.org>
Subject: Re: [RFC PATCH 0/7] Early task context tracking

On Wed, Apr 03, 2019 at 05:01:02PM -0700, Andy Lutomirski wrote:
> I would much rather do the opposite: completely remove context
> tracking from the asm and, instead, stick it into the C code.  We'd
> need to make sure that the C code is totally immune from tracing,
> kprobes, etc, but it would be a nice cleanup.  And then you could fix
> this bug in C!

Right, so you had some prelim patches toward that a few weeks ago. Esp.
for the idtentry stuff that looked fairly straight forward.