On Tue 23-02-21 12:56:25, Shakeel Butt wrote: > Replace the implicit checking of root memcg with explicit root memcg > checking i.e. !css->parent with mem_cgroup_is_root(). > > Signed-off-by: Shakeel Butt <shakeelb@xxxxxxxxxx> Acked-by: Michal Hocko <mhocko@xxxxxxxx> Thanks! > --- > mm/memcontrol.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/mm/memcontrol.c b/mm/memcontrol.c > index dcb5665aeb69..79046ad3eec0 100644 > --- a/mm/memcontrol.c > +++ b/mm/memcontrol.c > @@ -4141,7 +4141,7 @@ static int mem_cgroup_swappiness_write(struct cgroup_subsys_state *css, > if (val > 100) > return -EINVAL; > > - if (css->parent) > + if (!mem_cgroup_is_root(memcg)) > memcg->swappiness = val; > else > vm_swappiness = val; > @@ -4491,7 +4491,7 @@ static int mem_cgroup_oom_control_write(struct cgroup_subsys_state *css, > struct mem_cgroup *memcg = mem_cgroup_from_css(css); > > /* cannot set to root cgroup and only 0 and 1 are allowed */ > - if (!css->parent || !((val == 0) || (val == 1))) > + if (mem_cgroup_is_root(memcg) || !((val == 0) || (val == 1))) > return -EINVAL; > > memcg->oom_kill_disable = val; > -- > 2.30.0.617.g56c4b15f3c-goog -- Michal Hocko SUSE Labs
