linux-kernel - Re: [RFC PATCH for 4.21 00/16] rseq updates, new cpu

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Date:   Thu, 1 Nov 2018 08:33:35 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Paul McKenney <paulmck@...ux.vnet.ibm.com>,
        boqun.feng@...il.com,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-api@...r.kernel.org, tglx@...utronix.de, luto@...capital.net,
        davejwatson@...com, pjt@...gle.com,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux@....linux.org.uk, Ingo Molnar <mingo@...hat.com>,
        Peter Anvin <hpa@...or.com>, andi@...stfloor.org,
        Christoph Lameter <cl@...ux.com>, bmaurer@...com,
        rostedt@...dmis.org, josh@...htriplett.org,
        Catalin Marinas <catalin.marinas@....com>, will.deacon@....com,
        mtk.manpages@...il.com, joelaf@...gle.com
Subject: Re: [RFC PATCH for 4.21 00/16] rseq updates, new cpu_opv system call (v2)

On Thu, Nov 1, 2018 at 2:59 AM Mathieu Desnoyers
<mathieu.desnoyers@...icios.com> wrote:
>
> Here is an updated patchset submitted as RFC for 4.21 (next merge
> window).

So I'm not willing to take the cpu_opv system call until I see the the
regular rseq code getting more real-life use.

Maybe people are using it. Maybe they aren't. I want to hold off and
wait until we _know_ it's getting used, and not just in test
libraries.

                   Linus