From: Julia Lawall <julia@diku.dk>
Date: Sat, 17 Oct 2009 06:43:17 +0000 (+0200)
Subject: perf tools: Move dereference after NULL test
X-Git-Tag: v2.6.33-rc1~399^2~146^2~14^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f39cdf25bf77219676ec5360980ac40b1a7e144a;p=pandora-kernel.git

perf tools: Move dereference after NULL test

In each case, if the NULL test on thread is needed, then the
dereference should be after the NULL test.

A simplified version of the semantic match that detects this
problem is as follows (http://coccinelle.lip6.fr/):

// <smpl>
@match exists@
expression x, E;
identifier fld;
@@

* x->fld
  ... when != \(x = E\|&x\)
* x == NULL
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
LKML-Reference: <Pine.LNX.4.64.0910170842500.9213@ask.diku.dk>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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