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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 <konrad.wilk@oracle.com>
Signed-off-by: Bob Liu <lliubbo@gmail.com>
Cc: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Cc: Andor Daam <andor.daam@googlemail.com>
Cc: Dan Magenheimer <dan.magenheimer@oracle.com>
Cc: Florian Schmaus <fschmaus@gmail.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Stefan Hengelein <ilendir@googlemail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Konrad Rzeszutek Wilk 2013-04-30 15:27:01 -07:00 committed by Linus Torvalds
parent 10a7a07713
commit f42158fe67
2 changed files with 8 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
drivers/staging/zcache/zcache-main.c
View file

@ -1886,8 +1886,11 @@ static int __init 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,

5
drivers/xen/tmem.c
View file

@ -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);
}