Add scripts/coccinelle/err_cast.cocci

///

/// Use ERR_CAST inlined function instead of ERR_PTR(PTR_ERR(...))

///

// Confidence: High

// Copyright: (C) 2009, 2010 Nicolas Palix, DIKU.  GPLv2.

// Copyright: (C) 2009, 2010 Julia Lawall, DIKU.  GPLv2.

// Copyright: (C) 2009, 2010 Gilles Muller, INRIA/LiP6.  GPLv2.

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

// Options:

//

// Keywords: ERR_PTR, PTR_ERR, ERR_CAST

// Version min: 2.6.25

//

virtual context

virtual patch

virtual org

virtual report

@ depends on context && !patch && !org && !report@

expression x;

@@

* ERR_PTR(PTR_ERR(x))

@ depends on !context && patch && !org && !report @

expression x;

@@

- ERR_PTR(PTR_ERR(x))

+ ERR_CAST(x)

@r depends on !context && !patch && (org || report)@

expression x;

position p;

@@

 ERR_PTR@p(PTR_ERR(x))

@script:python depends on org@

p << r.p;

x << r.x;

@@

msg="WARNING ERR_CAST can be used with %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: ERR_CAST can be used with %s" % (x)

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