linux-kernel - Re: [PATCH v3 04/15] livepatch/x86: add TIF_PATCH

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Message-ID: <CALCETrWpNi_NrA15OGh4iicME-pb20oMmebiRSt8oRpxvpxF=g@mail.gmail.com>
Date:   Thu, 8 Dec 2016 10:27:40 -0800
From:   Andy Lutomirski <luto@...capital.net>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     Jessica Yu <jeyu@...hat.com>, Jiri Kosina <jikos@...nel.org>,
        Miroslav Benes <mbenes@...e.cz>,
        Petr Mladek <pmladek@...e.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        live-patching@...r.kernel.org,
        Michael Ellerman <mpe@...erman.id.au>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        X86 ML <x86@...nel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
        Vojtech Pavlik <vojtech@...e.com>, Jiri Slaby <jslaby@...e.cz>,
        Chris J Arges <chris.j.arges@...onical.com>,
        Andy Lutomirski <luto@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v3 04/15] livepatch/x86: add TIF_PATCH_PENDING thread flag

On Thu, Dec 8, 2016 at 10:08 AM, Josh Poimboeuf <jpoimboe@...hat.com> wrote:
> Add the TIF_PATCH_PENDING thread flag to enable the new livepatch
> per-task consistency model for x86_64.  The bit getting set indicates
> the thread has a pending patch which needs to be applied when the thread
> exits the kernel.
>
> The bit is placed in the _TIF_ALLWORK_MASK macro, which results in
> exit_to_usermode_loop() calling klp_update_patch_state() when it's set.
>
> Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>

Acked-by: Andy Lutomirski <luto@...nel.org>