[PATCH 4/7] io_uring/rsrc: get rid of io_rsrc_node allocation cache

[Jens Axboe <axboe@kernel.dk>]

It's not going to be needed in the fast path going forward, so kill it
off.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 include/linux/io_uring_types.h |  3 ---
 io_uring/io_uring.c            |  6 +-----
 io_uring/rsrc.c                | 24 +++++++++---------------
 3 files changed, 10 insertions(+), 23 deletions(-)

diff --git a/include/linux/io_uring_types.h b/include/linux/io_uring_types.h
index 93111d87a88a..60541da6b875 100644
--- a/include/linux/io_uring_types.h
+++ b/include/linux/io_uring_types.h
@@ -362,9 +362,6 @@ struct io_ring_ctx {
 	struct io_rsrc_data		*file_data;
 	struct io_rsrc_data		*buf_data;
 
-	/* protected by ->uring_lock */
-	struct io_alloc_cache		rsrc_node_cache;
-
 	u32			pers_next;
 	struct xarray		personalities;
 
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index 95ad74993a3f..8e24373c1c98 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -312,9 +312,7 @@ static __cold struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p)
 	INIT_LIST_HEAD(&ctx->sqd_list);
 	INIT_LIST_HEAD(&ctx->cq_overflow_list);
 	INIT_LIST_HEAD(&ctx->io_buffers_cache);
-	ret = io_alloc_cache_init(&ctx->rsrc_node_cache, IO_NODE_ALLOC_CACHE_MAX,
-			    sizeof(struct io_rsrc_node));
-	ret |= io_alloc_cache_init(&ctx->apoll_cache, IO_POLL_ALLOC_CACHE_MAX,
+	ret = io_alloc_cache_init(&ctx->apoll_cache, IO_POLL_ALLOC_CACHE_MAX,
 			    sizeof(struct async_poll));
 	ret |= io_alloc_cache_init(&ctx->netmsg_cache, IO_ALLOC_CACHE_MAX,
 			    sizeof(struct io_async_msghdr));
@@ -358,7 +356,6 @@ static __cold struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p)
 free_ref:
 	percpu_ref_exit(&ctx->refs);
 err:
-	io_alloc_cache_free(&ctx->rsrc_node_cache, kfree);
 	io_alloc_cache_free(&ctx->apoll_cache, kfree);
 	io_alloc_cache_free(&ctx->netmsg_cache, io_netmsg_cache_free);
 	io_alloc_cache_free(&ctx->rw_cache, io_rw_cache_free);
@@ -2743,7 +2740,6 @@ static __cold void io_ring_ctx_free(struct io_ring_ctx *ctx)
 
 	WARN_ON_ONCE(!list_empty(&ctx->ltimeout_list));
 
-	io_alloc_cache_free(&ctx->rsrc_node_cache, kfree);
 	if (ctx->mm_account) {
 		mmdrop(ctx->mm_account);
 		ctx->mm_account = NULL;
diff --git a/io_uring/rsrc.c b/io_uring/rsrc.c
index 9822222a7acb..322749c7dee9 100644
--- a/io_uring/rsrc.c
+++ b/io_uring/rsrc.c
@@ -13,7 +13,6 @@
 #include <uapi/linux/io_uring.h>
 
 #include "io_uring.h"
-#include "alloc_cache.h"
 #include "openclose.h"
 #include "rsrc.h"
 #include "memmap.h"
@@ -132,19 +131,15 @@ struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx,
 {
 	struct io_rsrc_node *node;
 
-	node = io_alloc_cache_get(&ctx->rsrc_node_cache);
-	if (!node) {
-		node = kzalloc(sizeof(*node), GFP_KERNEL);
-		if (!node)
-			return NULL;
+	node = kzalloc(sizeof(*node), GFP_KERNEL);
+	if (node) {
+		node->ctx = ctx;
+		node->refs = 1;
+		node->type = type;
+		node->index = index;
+		node->tag = 0;
+		node->rsrc = NULL;
 	}
-
-	node->ctx = ctx;
-	node->refs = 1;
-	node->type = type;
-	node->index = index;
-	node->tag = 0;
-	node->rsrc = NULL;
 	return node;
 }
 
@@ -493,8 +488,7 @@ void io_free_rsrc_node(struct io_rsrc_node *node)
 		break;
 	}
 
-	if (!io_alloc_cache_put(&ctx->rsrc_node_cache, node))
-		kfree(node);
+	kfree(node);
 }
 
 static void __io_sqe_files_unregister(struct io_ring_ctx *ctx)
-- 
2.45.2