From: Al Viro <viro@ZenIV.linux.org.uk>
To: Alessandro Rubini <rubini@gnudd.com>
Cc: uwe@kleine-koenig.org, gregkh@linuxfoundation.org,
corbet@lwn.net, linux-kernel@vger.kernel.org,
thierry.reding@gmail.com, Michal.Vokac@ysoft.com,
akpm@linux-foundation.org, kernel@pengutronix.de
Subject: Re: [PATCH RFC] err.h: document that PTR_ERR should only be used if IS_ERR returns true
Date: Tue, 16 Oct 2018 19:06:51 +0100 [thread overview]
Message-ID: <20181016180650.GZ32577@ZenIV.linux.org.uk> (raw)
In-Reply-To: <20181015093708.GA22876@mail.gnudd.com>
On Mon, Oct 15, 2018 at 11:37:08AM +0200, Alessandro Rubini wrote:
> OTOH I admit you can compare any value with -EINVAL, after PTR_ERR.
> But in general you first detect the error condition and then split
> among error (or print a message according to the exact value.
if (IS_ERR(p) && PTR_ERR(p) == -ENOENT)
instead of
if (p == ERR_PTR(-ENOENT))
is ugly, obfuscating what's going on for no good reason and I'm going
to keep killing those every time I run into one...
next prev parent reply other threads:[~2018-10-16 18:07 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-14 20:28 [PATCH RFC] err.h: document that PTR_ERR should only be used if IS_ERR returns true Uwe Kleine-König
2018-10-15 9:37 ` Alessandro Rubini
2018-10-15 9:46 ` Uwe Kleine-König
2018-10-16 18:06 ` Al Viro [this message]
2018-10-16 19:29 ` Uwe Kleine-König
2018-10-16 20:10 ` Alessandro Rubini
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