[PATCH 0/2] fixups for memcg cgroup_lock conversion

[PATCH 0/2] fixups for memcg cgroup_lock conversion

[Glauber Costa]

Andrew,

Please consider applying the following fixups to two of the patches
in my latest cgroup_lock conversion series. Apparently, there were
some mistake while converting one of the functions,
mem_cgroup_oom_control_write. Smatch found this one due in kbuild
to the lock imbalance when exiting the function.

Names should be already in your fixup format.

Glauber Costa (2):
  memcg: fast hierarchy-aware child test fix
  memcg: replace cgroup_lock with memcg specific memcg_lock fix

 mm/memcontrol.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

-- 
1.8.1.2

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[PATCH 1/2] memcg: fast hierarchy-aware child test fix

[Glauber Costa]

---
 mm/memcontrol.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 25ac5f4..28252c9 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5883,8 +5883,7 @@ static int mem_cgroup_oom_control_write(struct cgroup *cgrp,
 
 	mutex_lock(&memcg_create_mutex);
 	/* oom-kill-disable is a flag for subhierarchy. */
-	if ((parent->use_hierarchy) ||
-	    (memcg->use_hierarchy && !list_empty(&cgrp->children))) {
+	if ((parent->use_hierarchy) || memcg_has_children(memcg)) {
 		cgroup_unlock();
 		return -EINVAL;
 	}
-- 
1.8.1.2

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Re: [PATCH 1/2] memcg: fast hierarchy-aware child test fix

[Michal Hocko]

Acked-by: Michal Hocko <mhocko@suse.cz>

On Mon 11-02-13 12:04:48, Glauber Costa wrote:
> ---
>  mm/memcontrol.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 25ac5f4..28252c9 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -5883,8 +5883,7 @@ static int mem_cgroup_oom_control_write(struct cgroup *cgrp,
>  
>  	mutex_lock(&memcg_create_mutex);
>  	/* oom-kill-disable is a flag for subhierarchy. */
> -	if ((parent->use_hierarchy) ||
> -	    (memcg->use_hierarchy && !list_empty(&cgrp->children))) {
> +	if ((parent->use_hierarchy) || memcg_has_children(memcg)) {
>  		cgroup_unlock();
>  		return -EINVAL;
>  	}
> -- 
> 1.8.1.2
> 
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-- 
Michal Hocko
SUSE Labs

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Re: [PATCH 1/2] memcg: fast hierarchy-aware child test fix

[Kamezawa Hiroyuki]

(2013/02/11 17:04), Glauber Costa wrote:
> ---
>   mm/memcontrol.c | 3 +--
>   1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 25ac5f4..28252c9 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -5883,8 +5883,7 @@ static int mem_cgroup_oom_control_write(struct cgroup *cgrp,
>   
>   	mutex_lock(&memcg_create_mutex);
>   	/* oom-kill-disable is a flag for subhierarchy. */
> -	if ((parent->use_hierarchy) ||
> -	    (memcg->use_hierarchy && !list_empty(&cgrp->children))) {
> +	if ((parent->use_hierarchy) || memcg_has_children(memcg)) {
>   		cgroup_unlock();
>   		return -EINVAL;
>   	}
> 

Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

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[PATCH 2/2] memcg: replace cgroup_lock with memcg specific memcg_lock fix

[Glauber Costa]

Signed-off-by: Glauber Costa <glommer@parallels.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
---
 mm/memcontrol.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 28252c9..03ebf68 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5884,7 +5884,7 @@ static int mem_cgroup_oom_control_write(struct cgroup *cgrp,
 	mutex_lock(&memcg_create_mutex);
 	/* oom-kill-disable is a flag for subhierarchy. */
 	if ((parent->use_hierarchy) || memcg_has_children(memcg)) {
-		cgroup_unlock();
+		mutex_unlock(&memcg_create_mutex);
 		return -EINVAL;
 	}
 	memcg->oom_kill_disable = val;
-- 
1.8.1.2

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Re: [PATCH 2/2] memcg: replace cgroup_lock with memcg specific memcg_lock fix

[Michal Hocko]

Ouch, I have totally missed this one.
Acked-by: Michal Hocko <mhocko@suse.cz>

On Mon 11-02-13 12:04:49, Glauber Costa wrote:
> Signed-off-by: Glauber Costa <glommer@parallels.com>
> Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
> ---
>  mm/memcontrol.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 28252c9..03ebf68 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -5884,7 +5884,7 @@ static int mem_cgroup_oom_control_write(struct cgroup *cgrp,
>  	mutex_lock(&memcg_create_mutex);
>  	/* oom-kill-disable is a flag for subhierarchy. */
>  	if ((parent->use_hierarchy) || memcg_has_children(memcg)) {
> -		cgroup_unlock();
> +		mutex_unlock(&memcg_create_mutex);
>  		return -EINVAL;
>  	}
>  	memcg->oom_kill_disable = val;
> -- 
> 1.8.1.2
> 
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-- 
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SUSE Labs

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Re: [PATCH 2/2] memcg: replace cgroup_lock with memcg specific memcg_lock fix

[Kamezawa Hiroyuki]

(2013/02/11 17:04), Glauber Costa wrote:
> Signed-off-by: Glauber Costa <glommer@parallels.com>
> Reported-by: Dan Carpenter <dan.carpenter@oracle.com>

I'm sorry I missed this...
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

> ---
>   mm/memcontrol.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 28252c9..03ebf68 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -5884,7 +5884,7 @@ static int mem_cgroup_oom_control_write(struct cgroup *cgrp,
>   	mutex_lock(&memcg_create_mutex);
>   	/* oom-kill-disable is a flag for subhierarchy. */
>   	if ((parent->use_hierarchy) || memcg_has_children(memcg)) {
> -		cgroup_unlock();
> +		mutex_unlock(&memcg_create_mutex);
>   		return -EINVAL;
>   	}
>   	memcg->oom_kill_disable = val;
> 


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