From: "Hua Zhong" <hzhong@gmail.com>
To: "'Nick Piggin'" <nickpiggin@yahoo.com.au>
Cc: "'Paul Mackerras'" <paulus@samba.org>,
"'Pekka Enberg'" <penberg@cs.helsinki.fi>,
"'Andrew Morton'" <akpm@osdl.org>,
"'James Morris'" <jmorris@namei.org>, <dwalker@mvista.com>,
<linux-kernel@vger.kernel.org>
Subject: RE: kfree(NULL)
Date: Sat, 22 Apr 2006 12:22:03 -0700 [thread overview]
Message-ID: <001b01c66642$0abdbf80$0200a8c0@nuitysystems.com> (raw)
In-Reply-To: <444A7E85.4030803@yahoo.com.au>
> It can reduce readability of the code [unless it is used in
> error path simplification, kfree(something) usually suggests
> kfree-an-object].
Consistency in coding style improves readability. Redundancy reduces readability.
The interface is simple and clear, and has been documented for decades, that is kfree (and free) accepts NULL. There is no ambiguity
here.
If you think "if (obj) kfree (obj);" is more readable than "kfree(obj);", fix the API to enforce it.
But if the kernel tree is full of "some caller checks NULL while others not", I hardly see it as readable. It'd just be confusing.
> I don't actually like kfree(NULL) any time except error
> paths. It is subjective, not crazy talk.
Documented interface is not subjective.
next prev parent reply other threads:[~2006-04-22 19:22 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-04-21 7:03 kfree(NULL) Daniel Walker
2006-04-21 7:22 ` kfree(NULL) James Morris
2006-04-21 8:54 ` kfree(NULL) Andrew Morton
2006-04-21 13:56 ` kfree(NULL) Vernon Mauery
2006-04-21 14:07 ` kfree(NULL) Dmitry Fedorov
2006-04-21 15:07 ` kfree(NULL) Jan Engelhardt
2006-04-21 19:22 ` kfree(NULL) Adrian Bunk
2006-04-21 20:30 ` kfree(NULL) Vernon Mauery
2006-04-21 20:54 ` kfree(NULL) Steven Rostedt
2006-04-21 21:38 ` kfree(NULL) Adrian Bunk
2006-04-22 11:56 ` kfree(NULL) Jörn Engel
2006-04-21 23:55 ` kfree(NULL) Paul Mackerras
2006-04-22 7:43 ` kfree(NULL) Pekka Enberg
2006-04-22 8:48 ` kfree(NULL) Paul Mackerras
2006-04-22 15:02 ` kfree(NULL) Pekka Enberg
2006-04-22 18:57 ` kfree(NULL) Hua Zhong
2006-04-22 19:05 ` kfree(NULL) Nick Piggin
2006-04-22 19:22 ` Hua Zhong [this message]
2006-04-22 19:25 ` kfree(NULL) Nick Piggin
2006-04-22 20:18 ` kfree(NULL) Jan Engelhardt
2006-04-23 16:50 ` kfree(NULL) Steven Rostedt
2006-04-22 11:34 ` kfree(NULL) Jesper Juhl
2006-04-21 14:06 ` kfree(NULL) Daniel Walker
[not found] <63XWg-1IL-5@gated-at.bofh.it>
[not found] ` <63YfP-26I-11@gated-at.bofh.it>
[not found] ` <63ZEY-45n-27@gated-at.bofh.it>
2006-04-21 15:25 ` kfree(NULL) Tilman Schmidt
2006-04-21 16:03 ` kfree(NULL) Daniel Walker
2006-04-21 17:48 ` kfree(NULL) Jörn Engel
2006-04-21 18:00 ` kfree(NULL) Steven Rostedt
2006-04-21 18:42 ` kfree(NULL) Daniel Walker
2006-04-21 18:56 ` kfree(NULL) Steven Rostedt
2006-04-21 19:26 ` kfree(NULL) Andrew Morton
-- strict thread matches above, loose matches on Subject: below --
2006-04-21 21:02 kfree(NULL) Hua Zhong
2006-04-21 21:11 ` kfree(NULL) Daniel Walker
2006-04-21 21:36 ` kfree(NULL) Michael Buesch
2006-04-21 21:42 ` kfree(NULL) Andrew Morton
2006-04-21 21:48 ` kfree(NULL) Andrew Morton
2006-04-21 22:53 ` kfree(NULL) Hua Zhong
2006-04-21 22:58 ` kfree(NULL) Daniel Walker
2006-04-21 23:03 ` kfree(NULL) Hua Zhong
2006-04-21 23:25 ` kfree(NULL) Andrew Morton
2006-04-21 23:27 ` kfree(NULL) Andrew Morton
2006-04-22 11:18 ` kfree(NULL) Jan Engelhardt
2006-04-22 12:05 kfree(NULL) linux
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