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zcache/tmem: Better error checking on frontswap_register_ops return value.

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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 <[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 15:27:01 -07:00 • committed by Linus Torvalds
commit f42158fe67
2 changed files with 8 additions and 2 deletions
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5
drivers/xen/tmem.c
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@ -397,8 +397,11 @@ 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%s\n", s);
}