linux-kernel - [PATCH 1/1] scripts/coccinelle: use BIT() macro if possible

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Date:	Sun, 27 Apr 2014 02:29:46 +0200
From:	Javier Martinez Canillas <javier@...hile0.org>
To:	Julia Lawall <Julia.Lawall@...6.fr>
Cc:	Gilles Muller <Gilles.Muller@...6.fr>,
	Nicolas Palix <nicolas.palix@...g.fr>,
	Michal Marek <mmarek@...e.cz>, cocci@...teme.lip6.fr,
	linux-kernel@...r.kernel.org,
	Javier Martinez Canillas <javier@...hile0.org>
Subject: [PATCH 1/1] scripts/coccinelle: use BIT() macro if possible

Using the BIT() macro instead of manually shifting bits
makes the code less error prone and also more readable.

Signed-off-by: Javier Martinez Canillas <javier@...hile0.org>
---

An example of the patches that can be obtained with this spatch:

http://www.mail-archive.com/linux-gpio@vger.kernel.org/msg02722.html

 scripts/coccinelle/api/bit.cocci | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 scripts/coccinelle/api/bit.cocci

diff --git a/scripts/coccinelle/api/bit.cocci b/scripts/coccinelle/api/bit.cocci
new file mode 100644
index 0000000..a5df73a
--- /dev/null
+++ b/scripts/coccinelle/api/bit.cocci
@@ -0,0 +1,25 @@
+// Use the macro BIT() macro if possible
+//
+// Confidence: High
+// Copyright (C) 2014 Javier Martinez Canillas.  GPLv2.
+// URL: http://coccinelle.lip6.fr/
+// Options: --include-headers
+
+@...bitops@
+@@
+
+#include <linux/bitops.h>
+
+@...ends on hasbitops@
+expression E;
+@@
+
+- 1 << E
++ BIT(E)
+
+@...ends on hasbitops@
+expression E;
+@@
+
+- BIT((E))
++ BIT(E)
-- 
1.9.1

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