linux-kernel - Re: [PATCH] cgroup: Fix compilation issue due to cgroup

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Message-ID: <aAEsDKh79cBV4P3i@slm.duckdns.org>
Date: Thu, 17 Apr 2025 06:27:56 -1000
From: Tejun Heo <tj@...nel.org>
To: gaoxu <gaoxu2@...or.com>
Cc: Johannes Weiner <hannes@...xchg.org>,
	"Michal Koutný" <mkoutny@...e.com>,
	"cgroups@...r.kernel.org" <cgroups@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"surenb@...gle.com" <surenb@...gle.com>,
	yipengxiang <yipengxiang@...or.com>
Subject: Re: [PATCH] cgroup: Fix compilation issue due to cgroup_mutex not
 being exported

On Thu, Apr 17, 2025 at 07:30:00AM +0000, gaoxu wrote:
> When adding folio_memcg function call in the zram module for
> Android16-6.12, the following error occurs during compilation:
> ERROR: modpost: "cgroup_mutex" [../soc-repo/zram.ko] undefined!
> 
> This error is caused by the indirect call to lockdep_is_held(&cgroup_mutex)
> within folio_memcg. The export setting for cgroup_mutex is controlled by
> the CONFIG_PROVE_RCU macro. If CONFIG_LOCKDEP is enabled while
> CONFIG_PROVE_RCU is not, this compilation error will occur.
> 
> To resolve this issue, add a parallel macro CONFIG_LOCKDEP control to
> ensure cgroup_mutex is properly exported when needed.
> 
> Signed-off-by: gao xu <gaoxu2@...or.com>

Applied to cgroup/for-6.15-fixes.

Thanks.

-- 
tejun