On Wed, Jul 18, 2012 at 11:05:30AM +0800, Wanpeng Li wrote:
> wrap mem_cgroup_from_css function to clarify get mem cgroup
> from cgroup_subsys_state.
>
> Signed-off-by: Wanpeng Li <[email protected]>
> Cc: Michal Hocko <[email protected]>
> Cc: Johannes Weiner <[email protected]>
> Cc: KAMEZAWA Hiroyuki <[email protected]>
> Cc: Andrew Morton <[email protected]>
> Cc: Gavin Shan <[email protected]>
> Cc: Wanpeng Li <[email protected]>
> Cc: [email protected]
> ---
> mm/memcontrol.c | 14 ++++++++++----
> 1 files changed, 10 insertions(+), 4 deletions(-)
>
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 58a08fc..20f6a15 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -396,6 +396,12 @@ static void mem_cgroup_put(struct mem_cgroup *memcg);
> #include <net/sock.h>
> #include <net/ip.h>
>
> +static inline
> +struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *s)
> +{
> + return container_of(s, struct mem_cgroup, css);
> +}
> +
> static bool mem_cgroup_is_root(struct mem_cgroup *memcg);
> void sock_update_memcg(struct sock *sk)
> {
> @@ -820,7 +826,7 @@ static void memcg_check_events(struct mem_cgroup *memcg,
> struct page *page)
>
> struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont)
> {
> - return container_of(cgroup_subsys_state(cont,
> + return mem_cgroup_from_css(cgroup_subsys_state(cont,
> mem_cgroup_subsys_id), struct mem_cgroup,
> css);
Hm?.. Here and below too many args to mem_cgroup_from_css().
Have you tested the code?
> }
> @@ -835,7 +841,7 @@ struct mem_cgroup *mem_cgroup_from_task(struct
> task_struct *p)
> if (unlikely(!p))
> return NULL;
>
> - return container_of(task_subsys_state(p, mem_cgroup_subsys_id),
> + return mem_cgroup_from_css(task_subsys_state(p, mem_cgroup_subsys_id),
> struct mem_cgroup, css);
> }
>
> @@ -922,7 +928,7 @@ struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup
> *root,
> css = css_get_next(&mem_cgroup_subsys, id + 1, &root->css, &id);
> if (css) {
> if (css == &root->css || css_tryget(css))
> - memcg = container_of(css,
> + memcg = mem_cgroup_from_css(css,
> struct mem_cgroup, css);
> } else
> id = 0;
> @@ -2406,7 +2412,7 @@ static struct mem_cgroup *mem_cgroup_lookup(unsigned
> short id)
> css = css_lookup(&mem_cgroup_subsys, id);
> if (!css)
> return NULL;
> - return container_of(css, struct mem_cgroup, css);
> + return mem_cgroup_from_css(css, struct mem_cgroup, css);
> }
>
> struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
> --
> 1.7.5.4
>
> --
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--
Kirill A. Shutemov
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