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cgroup: Fix compilation issue due to cgroup_mutex not being exported 

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@honor.com>
Acked-by: Michal Koutný <mkoutny@suse.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
gaoxu 2025-04-17 07:30:00 +00:00 committed by Tejun Heo
parent cfb2e2c57a
commit 87c259a7a3
1 changed files with 1 additions and 1 deletions
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2
kernel/cgroup/cgroup.c
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@ -90,7 +90,7 @@
DEFINE_MUTEX(cgroup_mutex);
DEFINE_SPINLOCK(css_set_lock);
#ifdef CONFIG_PROVE_RCU
#if (defined CONFIG_PROVE_RCU || defined CONFIG_LOCKDEP)
EXPORT_SYMBOL_GPL(cgroup_mutex);
EXPORT_SYMBOL_GPL(css_set_lock);
#endif