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cleancache: Make cleancache_init use a pointer for the ops

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Instead of using a backend_registered to determine whether a backend is
enabled.  This allows us to remove the backend_register check and just
do 'if (cleancache_ops)'

[v1: Rebase on top of b97c4b430b0a (ramster->zcache move]
Signed-off-by: Konrad Rzeszutek Wilk <[email protected]>
Signed-off-by: Bob Liu <[email protected]>
Cc: Wanpeng Li <[email protected]>
Cc: Andor Daam <[email protected]>
Cc: Dan Magenheimer <[email protected]>
Cc: Florian Schmaus <[email protected]>
Cc: Minchan Kim <[email protected]>
Cc: Stefan Hengelein <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Konrad Rzeszutek Wilk 2013-04-30 15:26:57 -07:00 • committed by Linus Torvalds
commit 833f8662af
4 changed files with 40 additions and 38 deletions
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6
drivers/xen/tmem.c
View file

@ -236,7 +236,7 @@ static int __init no_cleancache(char *s)
}
__setup("nocleancache", no_cleancache);
static struct cleancache_ops __initdata tmem_cleancache_ops = {
static struct cleancache_ops tmem_cleancache_ops = {
.put_page = tmem_cleancache_put_page,
.get_page = tmem_cleancache_get_page,
.invalidate_page = tmem_cleancache_flush_page,
@ -392,9 +392,9 @@ static int __init xen_tmem_init(void)
BUG_ON(sizeof(struct cleancache_filekey) != sizeof(struct tmem_oid));
if (tmem_enabled && use_cleancache) {
char *s = "";
struct cleancache_ops old_ops =
struct cleancache_ops *old_ops =
cleancache_register_ops(&tmem_cleancache_ops);
if (old_ops.init_fs != NULL)
if (old_ops)
s = " (WARNING: cleancache_ops overridden)";
printk(KERN_INFO "cleancache enabled, RAM provided by "
"Xen Transcendent Memory%s\n", s);