linux-kernel - Re: [PATCH 02/14] rseq: Introduce restartable sequences system call (v13)

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Date:   Wed, 16 May 2018 18:24:54 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:     "Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Andy Lutomirski <luto@...capital.net>,
        Dave Watson <davejwatson@...com>, linux-kernel@...r.kernel.org,
        linux-api@...r.kernel.org, Paul Turner <pjt@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Russell King <linux@....linux.org.uk>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>, Andrew Hunter <ahh@...gle.com>,
        Andi Kleen <andi@...stfloor.org>, Chris Lameter <cl@...ux.com>,
        Ben Maurer <bmaurer@...com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Josh Triplett <josh@...htriplett.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Joel Fernandes <joelaf@...gle.com>,
        Alexander Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH 02/14] rseq: Introduce restartable sequences system call
 (v13)

On Mon, Apr 30, 2018 at 06:44:21PM -0400, Mathieu Desnoyers wrote:
> Expose a new system call allowing each thread to register one userspace
> memory area to be used as an ABI between kernel and user-space for two
> purposes: user-space restartable sequences and quick access to read the
> current CPU number value from user-space.

> ---
>  MAINTAINERS                 |  11 ++
>  arch/Kconfig                |   7 +
>  fs/exec.c                   |   1 +
>  include/linux/sched.h       | 134 +++++++++++++++++
>  include/linux/syscalls.h    |   4 +-
>  include/trace/events/rseq.h |  57 +++++++
>  include/uapi/linux/rseq.h   | 133 +++++++++++++++++
>  init/Kconfig                |  23 +++
>  kernel/Makefile             |   1 +
>  kernel/fork.c               |   2 +
>  kernel/rseq.c               | 357 ++++++++++++++++++++++++++++++++++++++++++++
>  kernel/sched/core.c         |   2 +
>  kernel/sys_ni.c             |   3 +
>  13 files changed, 734 insertions(+), 1 deletion(-)
>  create mode 100644 include/trace/events/rseq.h
>  create mode 100644 include/uapi/linux/rseq.h
>  create mode 100644 kernel/rseq.c
> 

Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>