linux-kernel - Re: [coccicheck PATCH 1/5] Deletion of unnecessary checks before specific function calls

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Date:	Wed, 01 Oct 2014 16:06:30 +0200
From:	SF Markus Elfring <elfring@...rs.sourceforge.net>
To:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>
CC:	Coccinelle <cocci@...teme.lip6.fr>,
	kernel-janitors@...r.kernel.org, Michal Marek <mmarek@...e.cz>,
	Chi Pham <chidaph@...il.com>,
	Fabian Frederick <fabf@...net.be>,
	Joe Perches <joe@...ches.com>
Subject: Re: [coccicheck PATCH 1/5] Deletion of unnecessary checks before
 specific function calls

>>> If you are convinced that dropping the null tests is a good idea, then you 
>>> can submit the patch that makes the change to the relevant maintainers and 
>>> mailing lists.

>From 48c9c4f61a7d7ea98538e02631a981a429281005 Mon Sep 17 00:00:00 2001
From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Wed, 5 Mar 2014 18:15:34 +0100
Subject: [PATCH 1/5] Addition of a semantic patch file for showing unnecessary
 checks before a few known functions

This semantic patch pattern tries to find source code places where a check
is performed for an expression that is passed to a function (like "kfree")
which checks this single parameter itself for usability.
Redundant value or pointer checks can be avoided here.

The pattern contains a special comment in a regular expression for a SmPL
constraint which supports extensions.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 .../deletions/delete_unnecessary_checks_template1.cocci     | 13 +++++++++++++
 1 file changed, 13 insertions(+)
 create mode 100644
scripts/coccinelle/deletions/delete_unnecessary_checks_template1.cocci

diff --git
a/scripts/coccinelle/deletions/delete_unnecessary_checks_template1.cocci
b/scripts/coccinelle/deletions/delete_unnecessary_checks_template1.cocci
new file mode 100644
index 0000000..b092051
--- /dev/null
+++ b/scripts/coccinelle/deletions/delete_unnecessary_checks_template1.cocci
@@ -0,0 +1,13 @@
+@...ete_unnecessary_checks@
+expression x;
+identifier release =~ "^(?x)
+(?:
+   (?:kz?|slob_)free
+|
+   (?:
+# Alternation placeholder
+   )
+)$";
+@@
+-if (x)
+    release(x);
-- 
1.9.0


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