linux-kernel - Re: [PATCH v2 01/28] mm: memcontrol: remove dead code of checking parent memory cgroup

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Message-ID: <qazzssy5v5qpyg3xdamruibcpcd3cry3yywicxvaeq66hejcn3@snvaivqo52sw>
Date: Thu, 18 Dec 2025 15:31:27 -0800
From: Shakeel Butt <shakeel.butt@...ux.dev>
To: Qi Zheng <qi.zheng@...ux.dev>
Cc: hannes@...xchg.org, hughd@...gle.com, mhocko@...e.com, 
	roman.gushchin@...ux.dev, muchun.song@...ux.dev, david@...nel.org, 
	lorenzo.stoakes@...cle.com, ziy@...dia.com, harry.yoo@...cle.com, imran.f.khan@...cle.com, 
	kamalesh.babulal@...cle.com, axelrasmussen@...gle.com, yuanchu@...gle.com, weixugc@...gle.com, 
	chenridong@...weicloud.com, mkoutny@...e.com, akpm@...ux-foundation.org, 
	hamzamahfooz@...ux.microsoft.com, apais@...ux.microsoft.com, lance.yang@...ux.dev, 
	linux-mm@...ck.org, linux-kernel@...r.kernel.org, cgroups@...r.kernel.org, 
	Muchun Song <songmuchun@...edance.com>, Qi Zheng <zhengqi.arch@...edance.com>, 
	Chen Ridong <chenridong@...wei.com>
Subject: Re: [PATCH v2 01/28] mm: memcontrol: remove dead code of checking
 parent memory cgroup

On Wed, Dec 17, 2025 at 03:27:25PM +0800, Qi Zheng wrote:
> From: Muchun Song <songmuchun@...edance.com>
> 
> Since the no-hierarchy mode has been deprecated after the commit:
> 
>   commit bef8620cd8e0 ("mm: memcg: deprecate the non-hierarchical mode").
> 
> As a result, parent_mem_cgroup() will not return NULL except when passing
> the root memcg, and the root memcg cannot be offline. Hence, it's safe to
> remove the check on the returned value of parent_mem_cgroup(). Remove the
> corresponding dead code.
> 
> Signed-off-by: Muchun Song <songmuchun@...edance.com>
> Acked-by: Roman Gushchin <roman.gushchin@...ux.dev>
> Acked-by: Johannes Weiner <hannes@...xchg.org>
> Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>
> Reviewed-by: Harry Yoo <harry.yoo@...cle.com>
> Reviewed-by: Chen Ridong <chenridong@...wei.com>

Acked-by: Shakeel Butt <shakeel.butt@...ux.dev>