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/dlm/config.h | 60 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+) create mode 100644 fs/dlm/config.h (limited to 'fs/dlm/config.h') diff --git a/fs/dlm/config.h b/fs/dlm/config.h new file mode 100644 index 000000000..4ebd45f75 --- /dev/null +++ b/fs/dlm/config.h @@ -0,0 +1,60 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/****************************************************************************** +******************************************************************************* +** +** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. +** Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved. +** +** +******************************************************************************* +******************************************************************************/ + +#ifndef __CONFIG_DOT_H__ +#define __CONFIG_DOT_H__ + +#define DLM_MAX_SOCKET_BUFSIZE 4096 + +struct dlm_config_node { + int nodeid; + int weight; + bool gone; + int new; + uint32_t comm_seq; + unsigned int release_recover; +}; + +extern const struct rhashtable_params dlm_rhash_rsb_params; + +#define DLM_MAX_ADDR_COUNT 8 + +#define DLM_PROTO_TCP 0 +#define DLM_PROTO_SCTP 1 + +struct dlm_config_info { + __be16 ci_tcp_port; + unsigned int ci_buffer_size; + unsigned int ci_rsbtbl_size; + unsigned int ci_recover_timer; + unsigned int ci_toss_secs; + unsigned int ci_scan_secs; + unsigned int ci_log_debug; + unsigned int ci_log_info; + unsigned int ci_protocol; + unsigned int ci_mark; + unsigned int ci_new_rsb_count; + unsigned int ci_recover_callbacks; + char ci_cluster_name[DLM_LOCKSPACE_LEN]; +}; + +extern struct dlm_config_info dlm_config; + +int dlm_config_init(void); +void dlm_config_exit(void); +int dlm_config_nodes(char *lsname, struct dlm_config_node **nodes_out, + int *count_out); +int dlm_comm_seq(int nodeid, uint32_t *seq, bool locked); +int dlm_our_nodeid(void); +int dlm_our_addr(struct sockaddr_storage *addr, int num); + +#endif /* __CONFIG_DOT_H__ */ + -- cgit v1.3.1