From 4617721c502b2ddaa4e324e86da4997edf738fa5 Mon Sep 17 00:00:00 2001 From: Steven Rostedt Date: Wed, 2 Sep 2026 09:55:01 -0400 Subject: ftrace: Synchronize the initialization of ftrace_ops There's some internal state that ftrace_ops needs to have set, but since it can be declared outside of the ftrace.c code, it calls ftrace_ops_init() on the ops in every global function. The issue is that if two tasks call it on the same ops at the same time it is possible to have the initialization of one corrupt the initialization of the other call. Create a ops_mutex to use to synchronize every initialization of the ftrace_ops. The mutex is taken within checking the ftrace_ops flag that states it was initializied but the flag is checked again after the mutex has been taken. Checking first outside the mutex allows it to shortcut having to take the mutex. But then the check needs to be done again after the mute is taken in case of races. Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20260902095501.6b59af20@gandalf.local.home Fixes: f04f24fb7e48d ("ftrace, kprobes: Fix a deadlock on ftrace_regex_lock") Reported-by: sashiko-bot@kernel.org Close: https://lore.kernel.org/all/20260829025528.49A831F000E9@smtp.kernel.org/ Signed-off-by: Steven Rostedt --- fs/nfs/sysfs.h | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) create mode 100644 fs/nfs/sysfs.h (limited to 'fs/nfs/sysfs.h') diff --git a/fs/nfs/sysfs.h b/fs/nfs/sysfs.h new file mode 100644 index 000000000..c5d1990ca --- /dev/null +++ b/fs/nfs/sysfs.h @@ -0,0 +1,33 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2019 Hammerspace Inc + */ + +#ifndef __NFS_SYSFS_H +#define __NFS_SYSFS_H + +#define CONTAINER_ID_MAXLEN (64) + +struct nfs_netns_client { + struct kobject kobject; + struct kobject nfs_net_kobj; + struct net *net; + const char __rcu *identifier; +}; + +extern struct kobject *nfs_net_kobj; + +extern int nfs_sysfs_init(void); +extern void nfs_sysfs_exit(void); + +void nfs_netns_sysfs_setup(struct nfs_net *netns, struct net *net); +void nfs_netns_sysfs_destroy(struct nfs_net *netns); + +void nfs_sysfs_link_rpc_client(struct nfs_server *server, + struct rpc_clnt *clnt, const char *sysfs_prefix); +void nfs_sysfs_add_server(struct nfs_server *s); +void nfs_sysfs_move_server_to_sb(struct super_block *s); +void nfs_sysfs_move_sb_to_server(struct nfs_server *s); +void nfs_sysfs_remove_server(struct nfs_server *s); + +#endif -- cgit v1.3.1