[PATCH 1/2 cgroup/for-3.20] cgroup: reorder SUBSYS(blkio) in cgroup_subsys.h

[PATCH 1/2 cgroup/for-3.20] cgroup: reorder SUBSYS(blkio) in cgroup_subsys.h

[Tejun Heo]

The scheduled cgroup writeback support requires blkio to be
initialized before memcg as memcg needs to provide certain blkcg
related functionalities.  Relocate blkio so that it's right above
memory.

Signed-off-by: Tejun Heo <tj@kernel.org>
---
Hello,

These are two trivial patches to prepare for the cgroup writeback
support.  Applying to cgroup/for-3.20.

Thanks.

 include/linux/cgroup_subsys.h |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/include/linux/cgroup_subsys.h
+++ b/include/linux/cgroup_subsys.h
@@ -15,6 +15,10 @@ SUBSYS(cpu)
 SUBSYS(cpuacct)
 #endif
 
+#if IS_ENABLED(CONFIG_BLK_CGROUP)
+SUBSYS(blkio)
+#endif
+
 #if IS_ENABLED(CONFIG_MEMCG)
 SUBSYS(memory)
 #endif
@@ -31,10 +35,6 @@ SUBSYS(freezer)
 SUBSYS(net_cls)
 #endif
 
-#if IS_ENABLED(CONFIG_BLK_CGROUP)
-SUBSYS(blkio)
-#endif
-
 #if IS_ENABLED(CONFIG_CGROUP_PERF)
 SUBSYS(perf_event)
 #endif

[PATCH 2/2 cgroup/for-3.20] cgroup: add dummy css_put() for !CONFIG_CGROUPS

[Tejun Heo]

This will later be depended upon by the scheduled cgroup writeback
support.

Signed-off-by: Tejun Heo <tj@kernel.org>
---
 include/linux/cgroup.h |    4 ++++
 1 file changed, 4 insertions(+)

--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -943,6 +943,8 @@ struct cgroup_subsys_state *css_tryget_o
 
 #else /* !CONFIG_CGROUPS */
 
+struct cgroup_subsys_state;
+
 static inline int cgroup_init_early(void) { return 0; }
 static inline int cgroup_init(void) { return 0; }
 static inline void cgroup_fork(struct task_struct *p) {}
@@ -955,6 +957,8 @@ static inline int cgroupstats_build(stru
 	return -EINVAL;
 }
 
+static inline void css_put(struct cgroup_subsys_state *css) {}
+
 /* No cgroups - nothing to do */
 static inline int cgroup_attach_task_all(struct task_struct *from,
 					 struct task_struct *t)

Re: [PATCH 1/2 cgroup/for-3.20] cgroup: reorder SUBSYS(blkio) in cgroup_subsys.h

[Zefan Li]

On 2015/1/7 0:57, Tejun Heo wrote:
> The scheduled cgroup writeback support requires blkio to be
> initialized before memcg as memcg needs to provide certain blkcg
> related functionalities.  Relocate blkio so that it's right above
> memory.
> 
> Signed-off-by: Tejun Heo <tj@kernel.org>
> ---
> Hello,
> 
> These are two trivial patches to prepare for the cgroup writeback
> support.  Applying to cgroup/for-3.20.
> 

Acked-by: Zefan Li <lizefan@huawei.com>

Re: [PATCH 2/2 cgroup/for-3.20] cgroup: add dummy css_put() for !CONFIG_CGROUPS

[Zefan Li]

On 2015/1/7 0:58, Tejun Heo wrote:
> This will later be depended upon by the scheduled cgroup writeback
> support.
> 
> Signed-off-by: Tejun Heo <tj@kernel.org>

Acked-by: Zefan Li <lizefan@huawei.com>