linux-kernel - Re: [PATCH v2] mm: memcontrol: replace the loop with a list_for_each

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Message-ID: <20210204183743.GB1837780@carbon.DHCP.thefacebook.com>
Date:   Thu, 4 Feb 2021 10:37:43 -0800
From:   Roman Gushchin <guro@...com>
To:     Muchun Song <songmuchun@...edance.com>
CC:     <hannes@...xchg.org>, <mhocko@...nel.org>,
        <vdavydov.dev@...il.com>, <akpm@...ux-foundation.org>,
        <cgroups@...r.kernel.org>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] mm: memcontrol: replace the loop with a
 list_for_each_entry()

On Fri, Feb 05, 2021 at 12:30:55AM +0800, Muchun Song wrote:
> The rule of list walk has gone since:
> 
>  commit a9d5adeeb4b2 ("mm/memcontrol: allow to uncharge page without using page->lru field")
> 
> So remove the strange comment and replace the loop with a
> list_for_each_entry().
> 
> There is only one caller of the uncharge_list(). So just fold it into
> mem_cgroup_uncharge_list() and remove it.
> 
> Signed-off-by: Muchun Song <songmuchun@...edance.com>
> ---
> v2:
>  - Fold uncharge_list() to mem_cgroup_uncharge_list().
> 
>  mm/memcontrol.c | 35 ++++++++---------------------------
>  1 file changed, 8 insertions(+), 27 deletions(-)

Nice cleanup!

Acked-by: Roman Gushchin <guro@...com>

Thanks.