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

[Javier Martinez Canillas]

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@xxxxxxxxxxxx>
---

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

http://www.mail-archive.com/linux-gpio@xxxxxxxxxxxxxxx/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
+
+@hasbitops@
+@@
+
+#include <linux/bitops.h>
+
+@depends on hasbitops@
+expression E;
+@@
+
+- 1 << E
++ BIT(E)
+
+@depends on hasbitops@
+expression E;
+@@
+
+- BIT((E))
++ BIT(E)
-- 
1.9.1

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