Add scripts/coccinelle/alloc/drop_kmalloc_cast.cocci

///

/// Casting (void *) value returned by kmalloc is useless

/// as mentioned in Documentation/CodingStyle, Chap 14.

///

// Confidence: High

// Copyright: 2009,2010 Nicolas Palix, DIKU.  GPLv2.

// URL: http://coccinelle.lip6.fr/

// Options: -no_includes -include_headers

//

// Keywords: kmalloc, kzalloc, kcalloc

// Version min: < 2.6.12 kmalloc

// Version min: < 2.6.12 kcalloc

// Version min:   2.6.14 kzalloc

//

virtual context

virtual patch

virtual org

virtual report

//----------------------------------------------------------

//  For context mode

//----------------------------------------------------------

@depends on context@

type T;

@@

* (T *)

  \(kmalloc\|kzalloc\|kcalloc\)(...)

//----------------------------------------------------------

//  For patch mode

//----------------------------------------------------------

@depends on patch@

type T;

@@

- (T *)

  \(kmalloc\|kzalloc\|kcalloc\)(...)

//----------------------------------------------------------

//  For org and report mode

//----------------------------------------------------------

@r depends on org || report@

type T;

position p;

@@

 (T@p *)\(kmalloc\|kzalloc\|kcalloc\)(...)

@script:python depends on org@

p << r.p;

t << r.T;

@@

coccilib.org.print_safe_todo(p[0], t)

@script:python depends on report@

p << r.p;

t << r.T;

@@

msg="WARNING: casting value returned by k[cmz]alloc to (%s *) is useless." % (t)

coccilib.report.print_report(p[0], msg)