linux-kernel - Re: [PATCH net-next v3] checkpatch: warn about uses of ENOTSUPP

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Date:   Mon, 11 May 2020 17:00:49 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     kuba@...nel.org
Cc:     joe@...ches.com, netdev@...r.kernel.org, andrew@...n.ch,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v3] checkpatch: warn about uses of ENOTSUPP

From: Jakub Kicinski <kuba@...nel.org>
Date: Mon, 11 May 2020 10:08:07 -0700

> ENOTSUPP often feels like the right error code to use, but it's
> in fact not a standard Unix error. E.g.:
> 
> $ python
>>>> import errno
>>>> errno.errorcode[errno.ENOTSUPP]
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> AttributeError: module 'errno' has no attribute 'ENOTSUPP'
> 
> There were numerous commits converting the uses back to EOPNOTSUPP
> but in some cases we are stuck with the high error code for backward
> compatibility reasons.
> 
> Let's try prevent more ENOTSUPPs from getting into the kernel.
> 
> Recent example:
> https://lore.kernel.org/netdev/20200510182252.GA411829@lunn.ch/
> 
> v3 (Joe):
>  - fix the "not file" condition.
> 
> v2 (Joe):
>  - add a link to recent discussion,
>  - don't match when scanning files, not patches to avoid sudden
>    influx of conversion patches.
> https://lore.kernel.org/netdev/20200511165319.2251678-1-kuba@kernel.org/
> 
> v1:
> https://lore.kernel.org/netdev/20200510185148.2230767-1-kuba@kernel.org/
> 
> Suggested-by: Andrew Lunn <andrew@...n.ch>
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>
> Acked-by: Joe Perches <joe@...ches.com>

Applied, thanks Jakub.