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kobject: Constify struct kset_uevent_ops

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From: Linux Kernel Mailing List
Subject: kobject: Constify struct kset_uevent_ops
Date: Monday, March 8, 2010 - 1:59 pm

Gitweb:     http://git.kernel.org/linus/9cd43611ccfb46632bfa7d19f688924ea93f1613
Commit:     9cd43611ccfb46632bfa7d19f688924ea93f1613
Parent:     985fc176a6c03836454629be2f2a611ccc7c7002
Author:     Emese Revfy <re.emese@gmail.com>
AuthorDate: Thu Dec 31 14:52:51 2009 +0100
Committer:  Greg Kroah-Hartman <gregkh@suse.de>
CommitDate: Sun Mar 7 17:04:49 2010 -0800

    kobject: Constify struct kset_uevent_ops
    
    Constify struct kset_uevent_ops.
    
    This is part of the ops structure constification
    effort started by Arjan van de Ven et al.
    
    Benefits of this constification:
    
     * prevents modification of data that is shared
       (referenced) by many other structure instances
       at runtime
    
     * detects/prevents accidental (but not intentional)
       modification attempts on archs that enforce
       read-only kernel data at runtime
    
     * potentially better optimized code as the compiler
       can assume that the const data cannot be changed
    
     * the compiler/linker move const data into .rodata
       and therefore exclude them from false sharing
    
    Signed-off-by: Emese Revfy <re.emese@gmail.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
 drivers/base/bus.c      |    2 +-
 drivers/base/core.c     |    2 +-
 drivers/base/memory.c   |    2 +-
 fs/gfs2/sys.c           |    2 +-
 include/linux/kobject.h |   10 +++++-----
 kernel/params.c         |    2 +-
 lib/kobject.c           |    4 ++--
 lib/kobject_uevent.c    |    2 +-
 mm/slub.c               |    2 +-
 9 files changed, 14 insertions(+), 14 deletions(-)

diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index c0c5a43..2afe599 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -154,7 +154,7 @@ static int bus_uevent_filter(struct kset *kset, struct kobject *kobj)
 	return 0;
 }
 
-static struct kset_uevent_ops bus_uevent_ops = {
+static const struct kset_uevent_ops bus_uevent_ops = {
 	.filter = bus_uevent_filter,
 };
 
diff --git a/drivers/base/core.c b/drivers/base/core.c
index f6c73a9..58ec106 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -252,7 +252,7 @@ static int dev_uevent(struct kset *kset, struct kobject *kobj,
 	return retval;
 }
 
-static struct kset_uevent_ops device_uevent_ops = {
+static const struct kset_uevent_ops device_uevent_ops = {
 	.filter =	dev_uevent_filter,
 	.name =		dev_uevent_name,
 	.uevent =	dev_uevent,
diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index 495f15e..2f86915 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -44,7 +44,7 @@ static int memory_uevent(struct kset *kset, struct kobject *obj, struct kobj_uev
 	return retval;
 }
 
-static struct kset_uevent_ops memory_uevent_ops = {
+static const struct kset_uevent_ops memory_uevent_ops = {
 	.name		= memory_uevent_name,
 	.uevent		= memory_uevent,
 };
diff --git a/fs/gfs2/sys.c b/fs/gfs2/sys.c
index b5f1a46..5435030 100644
--- a/fs/gfs2/sys.c
+++ b/fs/gfs2/sys.c
@@ -574,7 +574,7 @@ static int gfs2_uevent(struct kset *kset, struct kobject *kobj,
 	return 0;
 }
 
-static struct kset_uevent_ops gfs2_uevent_ops = {
+static const struct kset_uevent_ops gfs2_uevent_ops = {
 	.uevent = gfs2_uevent,
 };
 
diff --git a/include/linux/kobject.h b/include/linux/kobject.h
index 58ae8e0..57a1eaa 100644
--- a/include/linux/kobject.h
+++ b/include/linux/kobject.h
@@ -118,9 +118,9 @@ struct kobj_uevent_env {
 };
 
 struct kset_uevent_ops {
-	int (*filter)(struct kset *kset, struct kobject *kobj);
-	const char *(*name)(struct kset *kset, struct kobject *kobj);
-	int (*uevent)(struct kset *kset, struct kobject *kobj,
+	int (* const filter)(struct kset *kset, struct kobject *kobj);
+	const char *(* const name)(struct kset *kset, struct kobject *kobj);
+	int (* const uevent)(struct kset *kset, struct kobject *kobj,
 		      struct kobj_uevent_env *env);
 };
 
@@ -155,14 +155,14 @@ struct kset {
 	struct list_head list;
 	spinlock_t list_lock;
 	struct kobject kobj;
-	struct kset_uevent_ops *uevent_ops;
+	const struct kset_uevent_ops *uevent_ops;
 };
 
 extern void kset_init(struct kset *kset);
 extern int __must_check kset_register(struct kset *kset);
 extern void kset_unregister(struct kset *kset);
 extern struct kset * __must_check kset_create_and_add(const char *name,
-						struct kset_uevent_ops *u,
+						const struct kset_uevent_ops *u,
 						struct kobject *parent_kobj);
 
 static inline struct kset *to_kset(struct kobject *kobj)
diff --git a/kernel/params.c b/kernel/params.c
index 8d95f54..48370be 100644
--- a/kernel/params.c
+++ b/kernel/params.c
@@ -736,7 +736,7 @@ static int uevent_filter(struct kset *kset, struct kobject *kobj)
 	return 0;
 }
 
-static struct kset_uevent_ops module_uevent_ops = {
+static const struct kset_uevent_ops module_uevent_ops = {
 	.filter = uevent_filter,
 };
 
diff --git a/lib/kobject.c b/lib/kobject.c
index b512b74..cecf5a0 100644
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -789,7 +789,7 @@ static struct kobj_type kset_ktype = {
  * If the kset was not able to be created, NULL will be returned.
  */
 static struct kset *kset_create(const char *name,
-				struct kset_uevent_ops *uevent_ops,
+				const struct kset_uevent_ops *uevent_ops,
 				struct kobject *parent_kobj)
 {
 	struct kset *kset;
@@ -832,7 +832,7 @@ static struct kset *kset_create(const char *name,
  * If the kset was not able to be created, NULL will be returned.
  */
 struct kset *kset_create_and_add(const char *name,
-				 struct kset_uevent_ops *uevent_ops,
+				 const struct kset_uevent_ops *uevent_ops,
 				 struct kobject *parent_kobj)
 {
 	struct kset *kset;
diff --git a/lib/kobject_uevent.c b/lib/kobject_uevent.c
index 920a3ca..c9d3a3e 100644
--- a/lib/kobject_uevent.c
+++ b/lib/kobject_uevent.c
@@ -95,7 +95,7 @@ int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
 	const char *subsystem;
 	struct kobject *top_kobj;
 	struct kset *kset;
-	struct kset_uevent_ops *uevent_ops;
+	const struct kset_uevent_ops *uevent_ops;
 	u64 seq;
 	int i = 0;
 	int retval = 0;
diff --git a/mm/slub.c b/mm/slub.c
index 0bfd386..a26753c 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -4409,7 +4409,7 @@ static int uevent_filter(struct kset *kset, struct kobject *kobj)
 	return 0;
 }
 
-static struct kset_uevent_ops slab_uevent_ops = {
+static const struct kset_uevent_ops slab_uevent_ops = {
 	.filter = uevent_filter,
 };
 
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kobject: Constify struct kset_uevent_ops, Linux Kernel Mailing ..., (Mon Mar 8, 1:59 pm)