From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S941196AbcHJTPi (ORCPT <rfc822;w@1wt.eu>);
	Wed, 10 Aug 2016 15:15:38 -0400
Received: from merlin.infradead.org ([205.233.59.134]:34234 "EHLO
	merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S933896AbcHJTM2 (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Wed, 10 Aug 2016 15:12:28 -0400
Date: Wed, 10 Aug 2016 15:33:06 +0200
From: Peter Zijlstra <peterz@infradead.org>
To: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
        Russell King <linux@arm.linux.org.uk>,
        Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>,
        "H. Peter Anvin" <hpa@zytor.com>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        linux-api <linux-api@vger.kernel.org>, Paul Turner <pjt@google.com>,
        Andrew Hunter <ahh@google.com>, Andy Lutomirski <luto@amacapital.net>,
        Andi Kleen <andi@firstfloor.org>, Dave Watson <davejwatson@fb.com>,
        Chris Lameter <cl@linux.com>, Ben Maurer <bmaurer@fb.com>,
        rostedt <rostedt@goodmis.org>,
        "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
        Josh Triplett <josh@joshtriplett.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will.deacon@arm.com>,
        Michael Kerrisk <mtk.manpages@gmail.com>,
        Boqun Feng <boqun.feng@gmail.com>
Subject: Re: [RFC PATCH v7 1/7] Restartable sequences system call
Message-ID: <20160810133306.GO30192@twins.programming.kicks-ass.net>
References: <1469135662-31512-1-git-send-email-mathieu.desnoyers@efficios.com>
 <1469135662-31512-2-git-send-email-mathieu.desnoyers@efficios.com>
 <20160803131940.GM6862@twins.programming.kicks-ass.net>
 <656745027.6624.1470773200334.JavaMail.zimbra@efficios.com>
 <20160809213314.GK30192@twins.programming.kicks-ass.net>
 <427989454.6732.1470782507345.JavaMail.zimbra@efficios.com>
 <20160810075044.GJ6879@twins.programming.kicks-ass.net>
 <1431024781.7024.1470835564859.JavaMail.zimbra@efficios.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <1431024781.7024.1470835564859.JavaMail.zimbra@efficios.com>
User-Agent: Mutt/1.5.23.1 (2014-03-12)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Wed, Aug 10, 2016 at 01:26:04PM +0000, Mathieu Desnoyers wrote:

> static bool rseq_update_cpu_id_event_counter(struct task_struct *t)
> {
>         union rseq_cpu_event u;
> 
>         u.e.cpu_id = raw_smp_processor_id();
>         u.e.event_counter = ++t->rseq_event_counter;
>         if (__put_user(u.v, &t->rseq->u.v))
>                 return false;
>         trace_rseq_inc(t->rseq_event_counter);

I had not previously noticed the trace_* muck, but I would suggest
passing in t and leaving it up to the tracepoint implementation to pick
out the value.

Also, since this not only increments (it also updates the cpu number)
the naming is 'wrong'.

>         return true;
> }