linux-kernel - [PATCH] Fix declaration of cgroup_mm_owner

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Message-Id: <B21AC749-D9D3-4B6C-B490-091F06F78E41@google.com>
Date:	Mon, 15 Sep 2008 11:41:47 -0700
From:	Paul Menage <menage@...gle.com>
To:	Pekka Enberg <penberg@...helsinki.fi>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] Fix declaration of cgroup_mm_owner_callbacks()

Fix declaration of cgroup_mm_owner_callbacks()

The choice of real/dummy declaration for cgroup_mm_owner_callbacks()
shouldn't be based on CONFIG_MM_OWNER, but on
CONFIG_CGROUPS. Otherwise kernel/exit.c fails to compile when
something other than a cgroups controller selects CONFIG_MM_OWNER

Signed-off-by: Paul Menage <menage@...gle.com>

---
include/linux/cgroup.h |   15 ++++++---------
1 file changed, 6 insertions(+), 9 deletions(-)

Index: mmowner-mmotm-2008-09-10/include/linux/cgroup.h
===================================================================
--- mmowner-mmotm-2008-09-10.orig/include/linux/cgroup.h
+++ mmowner-mmotm-2008-09-10/include/linux/cgroup.h
@@ -403,6 +403,9 @@ void cgroup_iter_end(struct cgroup *cgrp
int cgroup_scan_tasks(struct cgroup_scanner *scan);
int cgroup_attach_task(struct cgroup *, struct task_struct *);

+void cgroup_mm_owner_callbacks(struct task_struct *old,
+			       struct task_struct *new);
+
#else /* !CONFIG_CGROUPS */

static inline int cgroup_init_early(void) { return 0; }
@@ -421,15 +424,9 @@ static inline int cgroupstats_build(stru
	return -EINVAL;
}

+static inline void cgroup_mm_owner_callbacks(struct task_struct *old,
+					     struct task_struct *new) {}
+
#endif /* !CONFIG_CGROUPS */

-#ifdef CONFIG_MM_OWNER
-extern void
-cgroup_mm_owner_callbacks(struct task_struct *old, struct task_struct  
*new);
-#else /* !CONFIG_MM_OWNER */
-static inline void
-cgroup_mm_owner_callbacks(struct task_struct *old, struct task_struct  
*new)
-{
-}
-#endif /* CONFIG_MM_OWNER */
#endif /* _LINUX_CGROUP_H */

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