linux-kernel - mainline build failure due to d1d4ff5d11a5 ("cgroup: put cgroup_tryget_css() inside CONFIG_CGROUP

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Date:   Sat, 2 Sep 2023 12:32:28 +0100
From:   "Sudip Mukherjee (Codethink)" <sudipm.mukherjee@...il.com>
To:     Miaohe Lin <linmiaohe@...wei.com>, Tejun Heo <tj@...nel.org>
Cc:     Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        regressions@...ts.linux.dev
Subject: mainline build failure due to d1d4ff5d11a5 ("cgroup: put
 cgroup_tryget_css() inside CONFIG_CGROUP_SCHED")

Hi All,

The latest mainline kernel branch fails to build mips sb1250_swarm_defconfig with
the error:

kernel/cgroup/cgroup.c: In function 'cgroup_local_stat_show':
kernel/cgroup/cgroup.c:3699:15: error: implicit declaration of function 'cgroup_tryget_css'; did you mean 'cgroup_tryget'? [-Werror=implicit-function-declaration]
 3699 |         css = cgroup_tryget_css(cgrp, ss);
      |               ^~~~~~~~~~~~~~~~~
      |               cgroup_tryget
kernel/cgroup/cgroup.c:3699:13: warning: assignment to 'struct cgroup_subsys_state *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
 3699 |         css = cgroup_tryget_css(cgrp, ss);
      |             ^


git bisect pointed to d1d4ff5d11a5 ("cgroup: put cgroup_tryget_css() inside CONFIG_CGROUP_SCHED").

Reverting the commit has fixed the build failure.

I will be happy to test any patch or provide any extra log if needed.

#regzbot introduced: d1d4ff5d11a5887a9c4cfc00294bc68ba03e7c16

-- 
Regards
Sudip