linux-kernel - Re: XDP maintainer match (Was [PATCH v2 0/2] hwmon: (max127) Add Maxim MAX127 hardware monitoring)

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Date:   Thu, 19 Nov 2020 21:41:55 +0100
From:   Jesper Dangaard Brouer <brouer@...hat.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Joe Perches <joe@...ches.com>, Guenter Roeck <linux@...ck-us.net>,
        Tao Ren <rentao.bupt@...il.com>, Andrew Lunn <andrew@...n.ch>,
        Jean Delvare <jdelvare@...e.com>,
        Jonathan Corbet <corbet@....net>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        "David S . Miller" <davem@...emloft.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        linux-hwmon@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org, openbmc@...ts.ozlabs.org, taoren@...com,
        mikechoi@...com, brouer@...hat.com
Subject: Re: XDP maintainer match (Was  [PATCH v2 0/2] hwmon: (max127) Add
 Maxim MAX127 hardware monitoring)

On Thu, 19 Nov 2020 09:59:28 -0800
Jakub Kicinski <kuba@...nel.org> wrote:

> On Thu, 19 Nov 2020 09:09:53 -0800 Joe Perches wrote:
> > On Thu, 2020-11-19 at 17:35 +0100, Jesper Dangaard Brouer wrote:  
> > > On Thu, 19 Nov 2020 07:46:34 -0800 Jakub Kicinski <kuba@...nel.org> wrote:    
> >   
> > > I think it is a good idea to change the keyword (K:), but I'm not sure
> > > this catch what we want, maybe it does.  The pattern match are meant to
> > > catch drivers containing XDP related bits.
> > > 
> > > Previously Joe Perches <joe@...ches.com> suggested this pattern match,
> > > which I don't fully understand... could you explain Joe?
> > > 
> > >   (?:\b|_)xdp(?:\b|_)    
> > 
> > This regex matches only:
> > 
> > 	xdp
> > 	xdp_<anything>
> > 	<anything>_xdp_<anything>
> > 	<anything>_xdp
> >   
> > > For the filename (N:) regex match, I'm considering if we should remove
> > > it and list more files explicitly.  I think normal glob * pattern
> > > works, which should be sufficient.    
> > 
> > Lists are generally more specific than regex globs.  
> 
> Checking like Alexei did it seems Joe's version is faster and better:
> 
> $ git grep -l -E "[^a-z0-9]xdp[^a-z0-9]" | wc -l
> 295
> $ git grep -l -E '(\b|_)xdp(\b|_)' | wc -l
> 297
> $ time git grep -l -E '(\b|_)xdp(\b|_)' > /tmp/a

Okay, I guess this is the pattern you want: '(\b|_)xdp(\b|_)'

 
> Joe would you like to send a patch, or should I?

As you noticed I already send out a patch, I can send a new with your
pattern, as it seems to be faster.

-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  LinkedIn: http://www.linkedin.com/in/brouer