linux-kernel - Re: [PATCH v2 2/2] include/cgroup: separate {get,put}_cgroup

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Message-ID: <mknmd2234xviy6lv632hruk2sgc4senbrodlkt4xju6w7lo6zr@l5ky5h4uxddz>
Date: Fri, 9 May 2025 15:35:43 +0200
From: Michal Koutný <mkoutny@...e.com>
To: Joel Savitz <jsavitz@...hat.com>
Cc: linux-kernel@...r.kernel.org, Tejun Heo <tj@...nel.org>, 
	Johannes Weiner <hannes@...xchg.org>, Christian Brauner <brauner@...nel.org>, 
	Al Viro <viro@...iv.linux.org.uk>, cgroups@...r.kernel.org
Subject: Re: [PATCH v2 2/2] include/cgroup: separate {get,put}_cgroup_ns
 no-op case

On Thu, May 08, 2025 at 02:49:30PM -0400, Joel Savitz <jsavitz@...hat.com> wrote:
> When CONFIG_CGROUPS is not selected, {get,put}_cgroup_ns become no-ops
> and therefore it is not necessary to compile in the code for changing
> the reference count.
> 
> When CONFIG_CGROUP is selected, there is no valid case where
> either of {get,put}_cgroup_ns() will be called with a NULL argument.
> 
> Signed-off-by: Joel Savitz <jsavitz@...hat.com>
> ---
>  include/linux/cgroup.h | 26 ++++++++++++++------------
>  1 file changed, 14 insertions(+), 12 deletions(-)

Acked-by: Michal Koutný <mkoutny@...e.com>

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