To prepare for the dynamic allocation of shrinker instances
embedded in other structures, add a private_data field to
struct shrinker, so that we can use shrinker::private_data
to record and get the original embedded structure.

Signed-off-by: Qi Zheng <zhengqi.a...@bytedance.com>
---
 include/linux/shrinker.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/shrinker.h b/include/linux/shrinker.h
index 224293b2dd06..43e6fcabbf51 100644
--- a/include/linux/shrinker.h
+++ b/include/linux/shrinker.h
@@ -70,6 +70,8 @@ struct shrinker {
        int seeks;      /* seeks to recreate an obj */
        unsigned flags;
 
+       void *private_data;
+
        /* These are for internal use */
        struct list_head list;
 #ifdef CONFIG_MEMCG
-- 
2.30.2

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