In the past it either used to be NULL or the "older" backend. Now we
also return -Exx error codes.
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
---
drivers/staging/zcache/zcache-main.c | 5 ++++-
drivers/xen/tmem.c | 5 ++++-
2 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/staging/zcache/zcache-main.c b/drivers/staging/zcache/zcache-main.c
index 288c841..79c10af 100644
--- a/drivers/staging/zcache/zcache-main.c
+++ b/drivers/staging/zcache/zcache-main.c
@@ -1826,8 +1826,11 @@ static int zcache_init(void)
namestr, frontswap_has_exclusive_gets,
!disable_frontswap_ignore_nonactive);
#endif
- if (old_ops != NULL)
+ if (IS_ERR(old_ops) || old_ops) {
+ if (IS_ERR(old_ops))
+ return PTR_RET(old_ops);
pr_warn("%s: frontswap_ops overridden\n", namestr);
+ }
}
if (ramster_enabled)
ramster_init(!disable_cleancache, !disable_frontswap,
diff --git a/drivers/xen/tmem.c b/drivers/xen/tmem.c
index 9a4a9ec..2f939e5 100644
--- a/drivers/xen/tmem.c
+++ b/drivers/xen/tmem.c
@@ -395,8 +395,11 @@ static int xen_tmem_init(void)
frontswap_register_ops(&tmem_frontswap_ops);
tmem_frontswap_poolid = -1;
- if (old_ops)
+ if (IS_ERR(old_ops) || old_ops) {
+ if (IS_ERR(old_ops))
+ return PTR_ERR(old_ops);
s = " (WARNING: frontswap_ops overridden)";
+ }
printk(KERN_INFO "frontswap enabled, RAM provided by "
"Xen Transcendent Memory\n");
}
--
1.7.11.7
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