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cleancache: constify cleancache_ops structure

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The cleancache_ops structure is never modified, so declare it as const.

Done with the help of Coccinelle.

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Julia Lawall 2016-01-21 16:47:29 +01:00 committed by Konrad Rzeszutek Wilk
parent afd2ff9b7e
commit b3c6de492b
3 changed files with 4 additions and 4 deletions
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2
drivers/xen/tmem.c
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@ -242,7 +242,7 @@ static int tmem_cleancache_init_shared_fs(char *uuid, size_t pagesize)
return xen_tmem_new_pool(shared_uuid, TMEM_POOL_SHARED, pagesize); return xen_tmem_new_pool(shared_uuid, TMEM_POOL_SHARED, pagesize);
} }
static struct cleancache_ops tmem_cleancache_ops = { static const struct cleancache_ops tmem_cleancache_ops = {
.put_page = tmem_cleancache_put_page, .put_page = tmem_cleancache_put_page,
.get_page = tmem_cleancache_get_page, .get_page = tmem_cleancache_get_page,
.invalidate_page = tmem_cleancache_flush_page, .invalidate_page = tmem_cleancache_flush_page,

2
include/linux/cleancache.h
View file

@ -37,7 +37,7 @@ struct cleancache_ops {
void (*invalidate_fs)(int); void (*invalidate_fs)(int);
}; };
extern int cleancache_register_ops(struct cleancache_ops *ops); extern int cleancache_register_ops(const struct cleancache_ops *ops);
extern void __cleancache_init_fs(struct super_block *); extern void __cleancache_init_fs(struct super_block *);
extern void __cleancache_init_shared_fs(struct super_block *); extern void __cleancache_init_shared_fs(struct super_block *);
extern int __cleancache_get_page(struct page *); extern int __cleancache_get_page(struct page *);

4
mm/cleancache.c
View file

@ -22,7 +22,7 @@
* cleancache_ops is set by cleancache_register_ops to contain the pointers * cleancache_ops is set by cleancache_register_ops to contain the pointers
* to the cleancache "backend" implementation functions. * to the cleancache "backend" implementation functions.
*/ */
static struct cleancache_ops *cleancache_ops __read_mostly; static const struct cleancache_ops *cleancache_ops __read_mostly;
/* /*
* Counters available via /sys/kernel/debug/cleancache (if debugfs is * Counters available via /sys/kernel/debug/cleancache (if debugfs is
@ -49,7 +49,7 @@ static void cleancache_register_ops_sb(struct super_block *sb, void *unused)
/* /*
* Register operations for cleancache. Returns 0 on success. * Register operations for cleancache. Returns 0 on success.
*/ */
int cleancache_register_ops(struct cleancache_ops *ops) int cleancache_register_ops(const struct cleancache_ops *ops)
{ {
if (cmpxchg(&cleancache_ops, NULL, ops)) if (cmpxchg(&cleancache_ops, NULL, ops))
return -EBUSY; return -EBUSY;