[PATCH v4 10/11] xarray, radix-tree: enable sheaf support for kmem_cache

[Andreas Hindborg <a.hindborg@kernel.org>]

The rust null block driver plans to rely on preloading xarray nodes from
the radix_tree_node_cachep kmem_cache.

Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Signed-off-by: Andreas Hindborg <a.hindborg@kernel.org>
---
 lib/radix-tree.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index 976b9bd02a1b..1cf0012b15ad 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -1598,10 +1598,16 @@ void __init radix_tree_init(void)
 	BUILD_BUG_ON(RADIX_TREE_MAX_TAGS + __GFP_BITS_SHIFT > 32);
 	BUILD_BUG_ON(ROOT_IS_IDR & ~GFP_ZONEMASK);
 	BUILD_BUG_ON(XA_CHUNK_SIZE > 255);
-	radix_tree_node_cachep = kmem_cache_create("radix_tree_node",
-			sizeof(struct radix_tree_node), 0,
-			SLAB_PANIC | SLAB_RECLAIM_ACCOUNT,
-			radix_tree_node_ctor);
+
+	struct kmem_cache_args args = {
+		.ctor = radix_tree_node_ctor,
+		.sheaf_capacity = 64,
+	};
+
+	radix_tree_node_cachep = kmem_cache_create(
+		"radix_tree_node", sizeof(struct radix_tree_node), &args,
+		SLAB_PANIC | SLAB_RECLAIM_ACCOUNT);
+
 	ret = cpuhp_setup_state_nocalls(CPUHP_RADIX_DEAD, "lib/radix:dead",
 					NULL, radix_tree_cpu_dead);
 	WARN_ON(ret < 0);

-- 
2.51.2