* [PATCH] memcontrol: rcu_read_lock() to protect mm_match_cgroup()
@ 2008-11-21 8:49 Lai Jiangshan
2008-11-21 10:32 ` KAMEZAWA Hiroyuki
0 siblings, 1 reply; 2+ messages in thread
From: Lai Jiangshan @ 2008-11-21 8:49 UTC (permalink / raw)
To: Andrew Morton, Paul Menage, Linux Kernel Mailing List,
Linux Containers, KAMEZAWA Hiroyuki
mm_match_cgroup() calls cgroup_subsys_state().
we must use rcu_read_lock() to protect cgroup_subsys_state().
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
---
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 1fbe14d..ce89ff0 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -47,8 +47,15 @@ int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem);
extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
-#define mm_match_cgroup(mm, cgroup) \
- ((cgroup) == mem_cgroup_from_task((mm)->owner))
+static inline
+int mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *cgroup)
+{
+ struct mem_cgroup *mem;
+ rcu_read_lock();
+ mem = mem_cgroup_from_task((mm)->owner);
+ rcu_read_unlock();
+ return cgroup == mem;
+}
extern int
mem_cgroup_prepare_migration(struct page *page, struct page *newpage);
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: [PATCH] memcontrol: rcu_read_lock() to protect mm_match_cgroup()
2008-11-21 8:49 [PATCH] memcontrol: rcu_read_lock() to protect mm_match_cgroup() Lai Jiangshan
@ 2008-11-21 10:32 ` KAMEZAWA Hiroyuki
0 siblings, 0 replies; 2+ messages in thread
From: KAMEZAWA Hiroyuki @ 2008-11-21 10:32 UTC (permalink / raw)
To: Lai Jiangshan
Cc: Andrew Morton, Paul Menage, Linux Kernel Mailing List, Linux Containers
On Fri, 21 Nov 2008 16:49:43 +0800
Lai Jiangshan <laijs@cn.fujitsu.com> wrote:
>
> mm_match_cgroup() calls cgroup_subsys_state().
>
> we must use rcu_read_lock() to protect cgroup_subsys_state().
>
Thanks,
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
> Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
> ---
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> index 1fbe14d..ce89ff0 100644
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -47,8 +47,15 @@ int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem);
>
> extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
>
> -#define mm_match_cgroup(mm, cgroup) \
> - ((cgroup) == mem_cgroup_from_task((mm)->owner))
> +static inline
> +int mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *cgroup)
> +{
> + struct mem_cgroup *mem;
> + rcu_read_lock();
> + mem = mem_cgroup_from_task((mm)->owner);
> + rcu_read_unlock();
> + return cgroup == mem;
> +}
>
> extern int
> mem_cgroup_prepare_migration(struct page *page, struct page *newpage);
>
>
^ permalink raw reply [flat|nested] 2+ messages in thread
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2008-11-21 8:49 [PATCH] memcontrol: rcu_read_lock() to protect mm_match_cgroup() Lai Jiangshan
2008-11-21 10:32 ` KAMEZAWA Hiroyuki
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