From: Bob Liu <lliubbo@gmail.com>
To: linux-mm@kvack.org
Cc: dan.magenheimer@oracle.com, konrad.wilk@oracle.com,
sjenning@linux.vnet.ibm.com, gregkh@linuxfoundation.org,
akpm@linux-foundation.org, rcj@linux.vnet.ibm.com,
ngupta@vflare.org, minchan@kernel.org, ric.masonn@gmail.com,
Bob Liu <lliubbo@gmail.com>
Subject: [PATCH V2 09/11] zcache/tmem: Better error checking on frontswap_register_ops return value.
Date: Wed, 6 Mar 2013 16:51:28 +0800 [thread overview]
Message-ID: <1362559890-16710-9-git-send-email-lliubbo@gmail.com> (raw)
In-Reply-To: <1362559890-16710-1-git-send-email-lliubbo@gmail.com>
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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>
---
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 3554987..48e46c5 100644
--- a/drivers/staging/zcache/zcache-main.c
+++ b/drivers/staging/zcache/zcache-main.c
@@ -2006,8 +2006,11 @@ 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,
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");
}
--
1.7.10.4
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next prev parent reply other threads:[~2013-03-06 8:53 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-06 8:51 [PATCH V2 01/11] mm: frontswap: lazy initialization to allow tmem backends to build/run as modules Bob Liu
2013-03-06 8:51 ` [PATCH V2 02/11] frontswap: Make frontswap_init use a pointer for the ops Bob Liu
2013-03-06 8:51 ` [PATCH V2 03/11] mm: frontswap: cleanup code Bob Liu
2013-03-06 14:55 ` Konrad Rzeszutek Wilk
2013-03-06 8:51 ` [PATCH V2 04/11] frontswap: Get rid of swap_lock dependency Bob Liu
2013-03-06 8:51 ` [PATCH V2 05/11] mm: cleancache: lazy initialization to allow tmem backends to build/run as modules Bob Liu
2013-03-06 8:51 ` [PATCH V2 06/11] cleancache: Make cleancache_init use a pointer for the ops Bob Liu
2013-03-06 8:51 ` [PATCH V2 07/11] mm: cleancache: clean up cleancache_enabled Bob Liu
2013-03-06 8:51 ` [PATCH V2 08/11] xen: tmem: enable Xen tmem shim to be built/loaded as a module Bob Liu
2013-03-06 8:51 ` Bob Liu [this message]
2013-03-06 8:51 ` [PATCH V2 10/11] staging: zcache: enable ramster " Bob Liu
2013-03-06 8:51 ` [PATCH V2 11/11] staging: zcache: enable zcache " Bob Liu
2013-03-06 12:36 ` [PATCH V2 01/11] mm: frontswap: lazy initialization to allow tmem backends to build/run as modules Ric Mason
2013-03-07 10:10 ` Bob Liu
2013-03-27 21:09 ` Andrew Morton
2013-03-28 2:09 ` Bob Liu
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