netdev - Re: [PATCH net-next v2] checkpatch: warn about uses of ENOTSUPP

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Message-ID: <20200511100747.15637fa2@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Mon, 11 May 2020 10:07:47 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Joe Perches <joe@...ches.com>
Cc:     davem@...emloft.net, Andrew Morton <akpm@...ux-foundation.org>,
        netdev@...r.kernel.org, andrew@...n.ch,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v2] checkpatch: warn about uses of ENOTSUPP

On Mon, 11 May 2020 10:03:31 -0700 Joe Perches wrote:
> On Mon, 2020-05-11 at 09:53 -0700, Jakub Kicinski wrote:
> > ENOTSUPP often feels like the right error code to use, but it's
> > in fact not a standard Unix error. E.g.:  
> []
> > diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl  
> []
> > @@ -4199,6 +4199,17 @@ sub process {
> >  			     "ENOSYS means 'invalid syscall nr' and nothing else\n" . $herecurr);
> >  		}
> >  
> > +# ENOTSUPP is not a standard error code and should be avoided in new patches.
> > +# Folks usually mean EOPNOTSUPP (also called ENOTSUP), when they type ENOTSUPP.
> > +# Similarly to ENOSYS warning a small number of false positives is expected.
> > +		if (~$file && $line =~ /\bENOTSUPP\b/) {  
> 
> It's probably my typo or my brain thinking "not" and hitting
> the tilde and not the bang, but this should be
> 
> 		if (!$file & ...)

Ahh! :)

> Otherwise:
> 
> Acked-by: Joe Perches <joe@...ches.com>

Thanks!