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Driver core: Constify struct sysfs_ops in struct kobj_type

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Constify struct sysfs_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>
Acked-by: David Teigland <teigland@redhat.com>
Acked-by: Matt Domsch <Matt_Domsch@dell.com>
Acked-by: Maciej Sosnowski <maciej.sosnowski@intel.com>
Acked-by: Hans J. Koch <hjk@linutronix.de>
Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>
Acked-by: Jens Axboe <jens.axboe@oracle.com>
Acked-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Emese Revfy 2010-01-19 02:58:23 +01:00 • committed by Greg Kroah-Hartman
parent 6c1733aca0
commit 52cf25d0ab
54 changed files with 69 additions and 70 deletions
Download patch file Download diff file Expand all files Collapse all files

4
include/linux/kobject.h
View file

@ -106,7 +106,7 @@ extern char *kobject_get_path(struct kobject *kobj, gfp_t flag);
struct kobj_type {
void (*release)(struct kobject *kobj);
struct sysfs_ops *sysfs_ops;
const struct sysfs_ops *sysfs_ops;
struct attribute **default_attrs;
};
@ -132,7 +132,7 @@ struct kobj_attribute {
const char *buf, size_t count);
};
extern struct sysfs_ops kobj_sysfs_ops;
extern const struct sysfs_ops kobj_sysfs_ops;
/**
* struct kset - a set of kobjects of a specific type, belonging to a specific subsystem.