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SubjectRe: [PATCH] mm: memcontrol: eliminate redundant check in __mem_cgroup_insert_exceeded()
On Fri 09-10-20 09:51:04, Miaohe Lin wrote:
> The mz->usage_in_excess >= mz_node->usage_in_excess check is exactly the
> else case of mz->usage_in_excess < mz_node->usage_in_excess. So we could
> replace else if (mz->usage_in_excess >= mz_node->usage_in_excess) with else
> equally.
>
> Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>

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

I believe this is a result of a very unreadable code. Resp. the comment
makes it hard to follow. It would be slightly better to simply drop the
comment which doesn't really explain much IMHO.

> ---
> mm/memcontrol.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 2636f8bad908..f607afd0fcbf 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -629,7 +629,7 @@ static void __mem_cgroup_insert_exceeded(struct mem_cgroup_per_node *mz,
> * We can't avoid mem cgroups that are over their soft
> * limit by the same amount
> */
> - else if (mz->usage_in_excess >= mz_node->usage_in_excess)
> + else
> p = &(*p)->rb_right;
> }
>
> --
> 2.19.1

--
Michal Hocko
SUSE Labs

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