linux-kernel - [PATCH] crypto: make Open Firmware device id constant

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Message-ID: <4B4C2C69.9000804@freemail.hu>
Date:	Tue, 12 Jan 2010 09:01:45 +0100
From:	Németh Márton <nm127@...email.hu>
To:	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>
CC:	linux-crypto@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Julia Lawall <julia@...u.dk>, cocci@...u.dk
Subject: [PATCH] crypto: make Open Firmware device id constant

From: Márton Németh <nm127@...email.hu>

The match_table field of the struct of_device_id is constant in <linux/of_platform.h>
so it is worth to make the initialization data also constant.

The semantic match that finds this kind of pattern is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@r@
disable decl_init,const_decl_init;
identifier I1, I2, x;
@@
	struct I1 {
	  ...
	  const struct I2 *x;
	  ...
	};
@s@
identifier r.I1, y;
identifier r.x, E;
@@
	struct I1 y = {
	  .x = E,
	};
@c@
identifier r.I2;
identifier s.E;
@@
	const struct I2 E[] = ... ;
@depends on !c@
identifier r.I2;
identifier s.E;
@@
+	const
	struct I2 E[] = ...;
// </smpl>

Signed-off-by: Márton Németh <nm127@...email.hu>
Cc: Julia Lawall <julia@...u.dk>
Cc: cocci@...u.dk
---
diff -u -p a/drivers/crypto/talitos.c b/drivers/crypto/talitos.c
--- a/drivers/crypto/talitos.c 2009-12-03 04:51:21.000000000 +0100
+++ b/drivers/crypto/talitos.c 2010-01-08 14:16:24.000000000 +0100
@@ -1958,7 +1958,7 @@ err_out:
 	return err;
 }

-static struct of_device_id talitos_match[] = {
+static const struct of_device_id talitos_match[] = {
 	{
 		.compatible = "fsl,sec2.0",
 	},
diff -u -p a/drivers/crypto/amcc/crypto4xx_core.c b/drivers/crypto/amcc/crypto4xx_core.c
--- a/drivers/crypto/amcc/crypto4xx_core.c 2009-12-03 04:51:21.000000000 +0100
+++ b/drivers/crypto/amcc/crypto4xx_core.c 2010-01-08 14:16:45.000000000 +0100
@@ -1274,7 +1274,7 @@ static int __exit crypto4xx_remove(struc
 	return 0;
 }

-static struct of_device_id crypto4xx_match[] = {
+static const struct of_device_id crypto4xx_match[] = {
 	{ .compatible      = "amcc,ppc4xx-crypto",},
 	{ },
 };
--
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