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SubjectRe: [PATCH 1/1] Constify struct kset_uevent_ops for 2.6.33-rc2
From: Emese Revfy <re.emese@gmail.com>

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>
---
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 2820257..82bd3ff 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 d7d77d4..0bcf8c2 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 0dc3462..9be733e 100644
--- a/fs/gfs2/sys.c
+++ b/fs/gfs2/sys.c
@@ -576,7 +576,7 @@ 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 cf1b691..ac5de7d 100644
--- a/kernel/params.c
+++ b/kernel/params.c
@@ -737,7 +737,7 @@ 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 8d71aaf..02b5a83 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -4538,7 +4538,7 @@ 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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