linux-kernel - Re: [RFC PATCH for 4.18 10/16] powerpc: Wire up restartable sequences system call

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Message-ID: <874lihbykr.fsf@concordia.ellerman.id.au>
Date:   Tue, 05 Jun 2018 15:18:44 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Peter Zijlstra <peterz@...radead.org>,
        "Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Andy Lutomirski <luto@...capital.net>,
        Dave Watson <davejwatson@...com>
Cc:     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>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [RFC PATCH for 4.18 10/16] powerpc: Wire up restartable sequences system call

Mathieu Desnoyers <mathieu.desnoyers@...icios.com> writes:

> From: Boqun Feng <boqun.feng@...il.com>
>
> Wire up the rseq system call on powerpc.
>
> This provides an ABI improving the speed of a user-space getcpu
> operation on powerpc by skipping the getcpu system call on the fast
> path, as well as improving the speed of user-space operations on per-cpu
> data compared to using load-reservation/store-conditional atomics.
>
> Signed-off-by: Boqun Feng <boqun.feng@...il.com>
> Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
> CC: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> CC: Paul Mackerras <paulus@...ba.org>
> CC: Michael Ellerman <mpe@...erman.id.au>
> CC: Peter Zijlstra <peterz@...radead.org>
> CC: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
> CC: linuxppc-dev@...ts.ozlabs.org
> ---
>  arch/powerpc/include/asm/systbl.h      | 1 +
>  arch/powerpc/include/asm/unistd.h      | 2 +-
>  arch/powerpc/include/uapi/asm/unistd.h | 1 +
>  3 files changed, 3 insertions(+), 1 deletion(-)

Looks fine to me.

I don't have any other new syscalls in my next, so this should not
conflict with anything for 4.18.

Acked-by: Michael Ellerman <mpe@...erman.id.au> (powerpc)


cheers