Re: [PATCH 1/2] mm/slab: restore the rcutree. prefix of the kvfree_rcu parameters

[Harry Yoo]

I adjusted my feedback. End result:

mm/slab: restore the rcutree. prefix of the kvfree_rcu parameters

The move of kvfree_rcu() to mm/slab_common.c dropped the "rcutree."
MODULE_PARAM_PREFIX, so rcu_min_cached_objs and
rcu_delay_page_cache_fill_msec became slab_common.* and the documented
rcutree.* names are silently ignored.  Restore the prefix; the
slab_common.* names, never documented, stop working.

Fixes: bbe658d65802 ("mm/slab: Move kvfree_rcu() into SLAB")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Zhan Xusheng <zhanxusheng@xxxxxxxxxx>
Reviewed-by: Harry Yoo (Meta) <harry@xxxxxxxxxx>
Link: https://patch.msgid.link/20261028134647.3176080-1-zhanxusheng1024@xxxxxxxxx
Signed-off-by: Harry Yoo (Meta) <harry@xxxxxxxxxx>
---
 mm/slab_common.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/mm/slab_common.c b/mm/slab_common.c
index 01c64ef661e7..41dea01a8c1f 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -1367,6 +1367,10 @@ void __init kvfree_rcu_init(void)
 
 #else /* CONFIG_KVFREE_RCU_BATCHED */
 
+/* Keep the prefix inherited from RCU */
+#undef MODULE_PARAM_PREFIX
+#define MODULE_PARAM_PREFIX "rcutree."
+
 /*
  * This rcu parameter is runtime-read-only. It reflects
  * a minimum allowed number of objects which can be cached
-- 
2.54.0