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Add scripts/coccinelle/alloc/kzalloc-simple.cocci

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This semantic patch replaces a pair of calls to kmalloc and memset
by a single call to kzalloc.

It only looks for simple cases to avoid false positives.

Signed-off-by: Nicolas Palix <npalix@diku.dk>
Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Michal Marek <mmarek@suse.cz>
This commit is contained in:
Nicolas Palix 2010-06-06 17:15:04 +02:00 committed by Michal Marek
parent 51169c8015
commit cf5842de75
1 changed files with 82 additions and 0 deletions
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scripts/coccinelle/alloc/kzalloc-simple.cocci Normal file
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///
/// kzalloc should be used rather than kmalloc followed by memset 0
///
// Confidence: High
// Copyright: (C) 2009-2010 Julia Lawall, Nicolas Palix, DIKU. GPLv2.
// Copyright: (C) 2009-2010 Gilles Muller, INRIA/LiP6. GPLv2.
// URL: http://coccinelle.lip6.fr/rules/kzalloc.html
// Options: -no_includes -include_headers
//
// Keywords: kmalloc, kzalloc
// Version min: < 2.6.12 kmalloc
// Version min: 2.6.14 kzalloc
//
virtual context
virtual patch
virtual org
virtual report
//----------------------------------------------------------
// For context mode
//----------------------------------------------------------
@depends on context@
type T, T2;
expression x;
expression E1,E2;
statement S;
@@
* x = (T)kmalloc(E1,E2);
if ((x==NULL) || ...) S
* memset((T2)x,0,E1);
//----------------------------------------------------------
// For patch mode
//----------------------------------------------------------
@depends on patch@
type T, T2;
expression x;
expression E1,E2;
statement S;
@@
- x = (T)kmalloc(E1,E2);
+ x = kzalloc(E1,E2);
if ((x==NULL) || ...) S
- memset((T2)x,0,E1);
//----------------------------------------------------------
// For org mode
//----------------------------------------------------------
@r depends on org || report@
type T, T2;
expression x;
expression E1,E2;
statement S;
position p;
@@
x = (T)kmalloc@p(E1,E2);
if ((x==NULL) || ...) S
memset((T2)x,0,E1);
@script:python depends on org@
p << r.p;
x << r.x;
@@
msg="%s" % (x)
msg_safe=msg.replace("[","@(").replace("]",")")
coccilib.org.print_todo(p[0], msg_safe)
@script:python depends on report@
p << r.p;
x << r.x;
@@
msg="WARNING: kzalloc should be used for %s, instead of kmalloc/memset" % (x)
coccilib.report.print_report(p[0], msg)