linux-kernel - [RFC PATCH 12/15] turn task_struct

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Message-ID: <20260110040217.1927971-13-viro@zeniv.linux.org.uk>
Date: Sat, 10 Jan 2026 04:02:14 +0000
From: Al Viro <viro@...iv.linux.org.uk>
To: linux-mm@...ck.org
Cc: Vlastimil Babka <vbabka@...e.cz>,
	Harry Yoo <harry.yoo@...cle.com>,
	linux-fsdevel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Christian Brauner <brauner@...nel.org>,
	Jan Kara <jack@...e.cz>,
	Mateusz Guzik <mguzik@...il.com>,
	linux-kernel@...r.kernel.org
Subject: [RFC PATCH 12/15] turn task_struct_cachep static-duration

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 kernel/fork.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/kernel/fork.c b/kernel/fork.c
index f83ca2f5826f..8f0dfefd82f0 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -178,7 +178,8 @@ void __weak arch_release_task_struct(struct task_struct *tsk)
 {
 }
 
-static struct kmem_cache *task_struct_cachep;
+static struct kmem_cache_opaque task_struct_cache;
+#define task_struct_cachep to_kmem_cache(&task_struct_cache)
 
 static inline struct task_struct *alloc_task_struct_node(int node)
 {
@@ -860,7 +861,7 @@ void __init fork_init(void)
 
 	/* create a slab on which task_structs can be allocated */
 	task_struct_whitelist(&useroffset, &usersize);
-	task_struct_cachep = kmem_cache_create_usercopy("task_struct",
+	kmem_cache_setup_usercopy(task_struct_cachep, "task_struct",
 			arch_task_struct_size, align,
 			SLAB_PANIC|SLAB_ACCOUNT,
 			useroffset, usersize, NULL);
-- 
2.47.3