linux-kernel - [PATCH] scripts/coccinelle: semantic patch for ptr

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Date:	Sat, 24 Mar 2012 22:31:10 +0100
From:	Julia Lawall <Julia.Lawall@...6.fr>
To:	Gilles Muller <Gilles.Muller@...6.fr>,
	Nicolas Palix <npalix.work@...il.com>, cocci@...u.dk,
	linux-kernel@...r.kernel.org, mmarek@...e.cz
Cc:	kernel-janitors@...r.kernel.org
Subject: [PATCH] scripts/coccinelle: semantic patch for ptr_err

From: Julia Lawall <Julia.Lawall@...6.fr>

Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

---
 scripts/coccinelle/api/ptr_ret.cocci |   70 +++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)

diff --git a/scripts/coccinelle/api/ptr_ret.cocci b/scripts/coccinelle/api/ptr_ret.cocci
new file mode 100644
index 0000000..085120f
--- /dev/null
+++ b/scripts/coccinelle/api/ptr_ret.cocci
@@ -0,0 +1,70 @@
+///
+/// Use PTR_RET rather than if(IS_ERR(...)) + PTR_ERR
+///
+// Confidence: High
+// Copyright: (C) 2012 Julia Lawall, INRIA/LIP6.  GPLv2.
+// Copyright: (C) 2012 Gilles Muller, INRIA/LiP6.  GPLv2.
+// URL: http://coccinelle.lip6.fr/
+// Options: -no_includes -include_headers
+//
+// Keywords: ERR_PTR, PTR_ERR, PTR_RET
+// Version min: 2.6.39
+//
+
+virtual context
+virtual patch
+virtual org
+virtual report
+
+@...ends on patch@
+expression ptr;
+@@
+
+- if (IS_ERR(ptr)) return PTR_ERR(ptr); else return 0;
++ return PTR_RET(ptr);
+
+@...ends on patch@
+expression ptr;
+@@
+
+- if (IS_ERR(ptr)) return PTR_ERR(ptr); return 0;
++ return PTR_RET(ptr);
+
+@r1 depends on !patch@
+expression ptr;
+position p1;
+@@
+
+* if@p1 (IS_ERR(ptr)) return PTR_ERR(ptr); else return 0;
+
+@r2 depends on !patch@
+expression ptr;
+position p2;
+@@
+
+* if@p2 (IS_ERR(ptr)) return PTR_ERR(ptr); return 0;
+
+@...ipt:python depends on org@
+p << r1.p1;
+@@
+
+coccilib.org.print_todo(p[0], "WARNING: PTR_ERR can be used")
+
+
+@...ipt:python depends on org@
+p << r2.p2;
+@@
+
+coccilib.org.print_todo(p[0], "WARNING: PTR_ERR can be used")
+
+@...ipt:python depends on report@
+p << r1.p1;
+@@
+
+coccilib.report.print_report(p[0], "WARNING: PTR_ERR can be used")
+
+@...ipt:python depends on report@
+p << r2.p2;
+@@
+
+coccilib.report.print_report(p[0], "WARNING: PTR_ERR can be used")

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