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FROMLIST: cgroup: Fix compilation issue due to cgroup_mutex not being exported

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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>

Bug: 409264079
Link: https://lore.kernel.org/cgroups/24763f5c8a13421fa6dc3672a57a7836@honor.com/T/#u
Change-Id: I5d31371cb216b9aee6eedd5b5e5535ee01d7871d
Signed-off-by: yipeng xiang <yipengxiang@honor.corp-partner.google.com>
This commit is contained in:
gao xu
2025-04-17 15:08:47 +08:00
committed by Treehugger Robot
parent 4c11b10c0b
commit 912caa4559
1 changed files with 1 additions and 1 deletions
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kernel/cgroup/cgroup.c
+1 -1
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@@ -93,7 +93,7 @@
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