linux-kernel - [RFC PATCH 10/15] turn sighand

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Message-ID: <20260110040217.1927971-11-viro@zeniv.linux.org.uk>
Date: Sat, 10 Jan 2026 04:02:12 +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 10/15] turn sighand_cache static-duration

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 include/linux/signal.h | 3 ++-
 kernel/fork.c          | 4 ++--
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/include/linux/signal.h b/include/linux/signal.h
index f19816832f05..a0c7fee8b22a 100644
--- a/include/linux/signal.h
+++ b/include/linux/signal.h
@@ -323,7 +323,8 @@ static inline void disallow_signal(int sig)
 	kernel_sigaction(sig, SIG_IGN);
 }
 
-extern struct kmem_cache *sighand_cachep;
+extern struct kmem_cache_opaque sighand_cache;
+#define sighand_cachep to_kmem_cache(&sighand_cache)
 
 extern bool unhandled_signal(struct task_struct *tsk, int sig);
 
diff --git a/kernel/fork.c b/kernel/fork.c
index 8c4d9a81ef42..d5b7e4d51596 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -469,7 +469,7 @@ static struct kmem_cache_opaque signal_cache;
 #define signal_cachep to_kmem_cache(&signal_cache)
 
 /* SLAB cache for sighand_struct structures (tsk->sighand) */
-struct kmem_cache *sighand_cachep;
+struct kmem_cache_opaque sighand_cache;
 
 /* SLAB cache for files_struct structures (tsk->files) */
 struct kmem_cache_opaque files_cache;
@@ -3021,7 +3021,7 @@ void __init mm_cache_init(void)
 
 void __init proc_caches_init(void)
 {
-	sighand_cachep = kmem_cache_create("sighand_cache",
+	kmem_cache_setup(sighand_cachep, "sighand_cache",
 			sizeof(struct sighand_struct), 0,
 			SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_TYPESAFE_BY_RCU|
 			SLAB_ACCOUNT, sighand_ctor);
-- 
2.47.3