linux-kernel - Re: [PATCH 5.15 00/91] 5.15.108-rc1 review

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Date:   Wed, 19 Apr 2023 11:18:06 +0700
From:   Bagas Sanjaya <bagasdotme@...il.com>
To:     Tom Saeger <tom.saeger@...cle.com>,
        Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>,
        Yu Zhao <yuzhao@...gle.com>
Cc:     Naresh Kamboju <naresh.kamboju@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Waiman Long <longman@...hat.com>, stable@...r.kernel.org,
        patches@...ts.linux.dev, linux-kernel@...r.kernel.org,
        torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
        linux@...ck-us.net, shuah@...nel.org, patches@...nelci.org,
        lkft-triage@...ts.linaro.org, pavel@...x.de, jonathanh@...dia.com,
        f.fainelli@...il.com, sudipm.mukherjee@...il.com,
        srw@...dewatkins.net, rwarsow@....de, Tejun Heo <tj@...nel.org>,
        Michal Koutný <mkoutny@...e.com>,
        Daniel Díaz <daniel.diaz@...aro.org>,
        Anders Roxell <anders.roxell@...aro.org>,
        Darren Kenny <darren.kenny@...cle.com>,
        Vegard Nossum <vegard.nossum@...cle.com>
Subject: Re: [PATCH 5.15 00/91] 5.15.108-rc1 review

On Tue, Apr 18, 2023 at 10:51:05AM -0600, Tom Saeger wrote:
> > Tom Saeger identified that the below commit moves it out of ifdef.
> > 
> > commit 354ed597442952fb680c9cafc7e4eb8a76f9514c
> > Author: Yu Zhao <yuzhao@...gle.com>
> > Date:   Sun Sep 18 02:00:07 2022 -0600
> > 
> >     mm: multi-gen LRU: kill switch
> > 
> FWIW - partially backporting (location of cgroup_mutex extern) from:
> 354ed5974429 ("mm: multi-gen LRU: kill switch")
> 
> fixes x86_64 build for me.
> 
> Regards,
> 
> --Tom
> 
> diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
> index 45cdb12243e3..460ba084888a 100644
> --- a/include/linux/cgroup.h
> +++ b/include/linux/cgroup.h
> @@ -433,6 +433,8 @@ static inline void cgroup_put(struct cgroup *cgrp)
>         css_put(&cgrp->self);
>  }
> 
> +extern struct mutex cgroup_mutex;
> +
>  /**
>   * task_css_set_check - obtain a task's css_set with extra access conditions
>   * @task: the task to obtain css_set for
> @@ -447,7 +449,6 @@ static inline void cgroup_put(struct cgroup *cgrp)
>   * as locks used during the cgroup_subsys::attach() methods.
>   */
>  #ifdef CONFIG_PROVE_RCU
> -extern struct mutex cgroup_mutex;
>  extern spinlock_t css_set_lock;
>  #define task_css_set_check(task, __c)                                  \
>         rcu_dereference_check((task)->cgroups,                          \
> diff --git a/kernel/cgroup/cgroup-internal.h b/kernel/cgroup/cgroup-internal.h
> index d8fcc139ac05..28c32a01da7d 100644
> --- a/kernel/cgroup/cgroup-internal.h
> +++ b/kernel/cgroup/cgroup-internal.h
> @@ -165,7 +165,6 @@ struct cgroup_mgctx {
>  #define DEFINE_CGROUP_MGCTX(name)                                              \
>         struct cgroup_mgctx name = CGROUP_MGCTX_INIT(name)
> 
> -extern struct mutex cgroup_mutex;
>  extern spinlock_t css_set_lock;
>  extern struct cgroup_subsys *cgroup_subsys[];
>  extern struct list_head cgroup_roots;

Yu, would you like to provide formal backport? Or maybe take Tom's
diff above and ACK it?

-- 
An old man doll... just what I always wanted! - Clara

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