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

[Zhan Xusheng <zhanxusheng1024@gmail.com>]

From: Zhan Xusheng <zhanxusheng@xiaomi.com>

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")
Signed-off-by: Zhan Xusheng <zhanxusheng@xiaomi.com>
---
 mm/slab_common.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/mm/slab_common.c b/mm/slab_common.c
index 01c64ef661e7..3729aa7a6156 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -1373,6 +1373,10 @@ void __init kvfree_rcu_init(void)
  * per-CPU. Object size is equal to one page. This value
  * can be changed at boot time.
  */
+/* These used to be rcutree parameters; keep their documented names. */
+#undef MODULE_PARAM_PREFIX
+#define MODULE_PARAM_PREFIX "rcutree."
+
 static int rcu_min_cached_objs = 5;
 module_param(rcu_min_cached_objs, int, 0444);
 

base-commit: 65ba8f34ec886ec72b2c07ddc8cf3d815c32869d
-- 
2.43.0