linux-kernel - Re: [PATCH] membarrier.2: Update prototype

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Message-ID: <0a4dfb59-8207-37af-1a77-561848bb0828@gmail.com>
Date:   Mon, 2 Nov 2020 17:46:54 +0100
From:   Alejandro Colomar <colomar.6.4.3@...il.com>
To:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:     Peter Oskolkov <posk@...k.io>, Peter Oskolkov <posk@...gle.com>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        linux-man <linux-man@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        paulmck <paulmck@...nel.org>, Boqun Feng <boqun.feng@...il.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Paul Turner <pjt@...gle.com>,
        Chris Kennelly <ckennelly@...gle.com>, shuah <shuah@...nel.org>
Subject: Re: [PATCH] membarrier.2: Update prototype



On 2020-11-02 13:30, Mathieu Desnoyers wrote:
> ----- On Nov 1, 2020, at 3:04 PM, Alejandro Colomar colomar.6.4.3@...il.com wrote:
> 
>> The Linux kernel now uses 'flags' and added a new argument: 'cpu_id'.
>> These changes were introduced to the kernel
>> in commit 2a36ab717e8fe678d98f81c14a0b124712719840.
> 
> I doubt the proposed patch with a FIXME and a TODO is appropriate for the man pages project.
> It does point out the fact that the membarrier man page needs updating following
> Peter's commit though.

Hi Mathieu,

Agree; I didn't intend this to be directly applied,
but to attract the attention of someone who knows the details,
and hopefully fix the whole issue at once :)

Thanks,

Alex

> 
> Peter (Oskolkov), can you contribute a patch detailing the new membarrier flags and cpu_id
> arguments to the man pages project ?
> 
> Thanks,
> 
> Mathieu
> 
>>
>> Signed-off-by: Alejandro Colomar <colomar.6.4.3@...il.com>
>> ---
>> man2/membarrier.2 | 9 ++++++++-
>> 1 file changed, 8 insertions(+), 1 deletion(-)
>>
>> diff --git a/man2/membarrier.2 b/man2/membarrier.2
>> index 24a24ba86..42b7e2acc 100644
>> --- a/man2/membarrier.2
>> +++ b/man2/membarrier.2
>> @@ -23,6 +23,13 @@
>> .\" %%%LICENSE_END
>> .\"
>> .TH MEMBARRIER 2 2020-06-09 "Linux" "Linux Programmer's Manual"
>> +.\" FIXME:
>> +.\" The Linux kernel now uses 'flags' and added a new argument: 'cpu_id'.
>> +.\" These changes were introduced to the kernel
>> +.\" in commit 2a36ab717e8fe678d98f81c14a0b124712719840.
>> +.\" The prototype has been updated,
>> +.\" but the new features have not yet been documented.
>> +.\" TODO: Document those new features.
>> .SH NAME
>> membarrier \- issue memory barriers on a set of threads
>> .SH SYNOPSIS
>> @@ -30,7 +37,7 @@ membarrier \- issue memory barriers on a set of threads
>> .PP
>> .B #include <linux/membarrier.h>
>> .PP
>> -.BI "int membarrier(int " cmd ", int " flags ");"
>> +.BI "int membarrier(int " cmd ", unsigned int " flags ", int " cpu_id );
>> .fi
>> .PP
>> .IR Note :
>> --
>> 2.28.0
>