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Subject[PATCH] arch/sh: Replace an explicit computation by the use of the container_of macro
Date
From 945e75c0e3202ab4cd0b8f185ea4be5609806edb Mon Sep 17 00:00:00 2001
From: Nicolas Palix <npalix@diku.dk>
Date: Mon, 7 Dec 2009 10:38:55 +0100

The macro container_of from kernel.h performs the same
pointer arithmetic operation.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
type T;
expression mptr;
expression member;
@@

- (void *)((char *)mptr - offsetof(T, member))
+ container_of(mptr, T, member)
// </smpl>

Signed-off-by: Nicolas Palix <npalix@diku.dk>
---
arch/sh/kernel/cpu/irq/ipr.c | 7 ++++---
1 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/arch/sh/kernel/cpu/irq/ipr.c b/arch/sh/kernel/cpu/irq/ipr.c
index c1508a9..9282d96 100644
--- a/arch/sh/kernel/cpu/irq/ipr.c
+++ b/arch/sh/kernel/cpu/irq/ipr.c
@@ -17,16 +17,17 @@
* for more details.
*/
#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
#include <linux/irq.h>
+#include <linux/kernel.h>
#include <linux/module.h>
-#include <linux/io.h>
-#include <linux/interrupt.h>
#include <linux/topology.h>

static inline struct ipr_desc *get_ipr_desc(unsigned int irq)
{
struct irq_chip *chip = get_irq_chip(irq);
- return (void *)((char *)chip - offsetof(struct ipr_desc, chip));
+ return container_of(chip, struct ipr_desc, chip);
}

static void disable_ipr_irq(unsigned int irq)
--
1.6.0.4


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