diff options
| -rw-r--r-- | include/linux/tracepoint.h | 5 | ||||
| -rw-r--r-- | include/trace/events/syscalls.h | 3 | ||||
| -rw-r--r-- | kernel/tracepoint.c | 6 |
3 files changed, 9 insertions, 5 deletions
diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h index 69a298b0735..9d30ee469c2 100644 --- a/include/linux/tracepoint.h +++ b/include/linux/tracepoint.h @@ -80,6 +80,11 @@ static inline void tracepoint_synchronize_unregister(void) synchronize_sched(); } +#ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS +extern void syscall_regfunc(void); +extern void syscall_unregfunc(void); +#endif /* CONFIG_HAVE_SYSCALL_TRACEPOINTS */ + #define PARAMS(args...) args #endif /* _LINUX_TRACEPOINT_H */ diff --git a/include/trace/events/syscalls.h b/include/trace/events/syscalls.h index 5a4c04a75b3..14e49c79813 100644 --- a/include/trace/events/syscalls.h +++ b/include/trace/events/syscalls.h @@ -13,9 +13,6 @@ #ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS -extern void syscall_regfunc(void); -extern void syscall_unregfunc(void); - TRACE_EVENT_FN(sys_enter, TP_PROTO(struct pt_regs *regs, long id), diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c index 162be198a24..ca2cfe21bb8 100644 --- a/kernel/tracepoint.c +++ b/kernel/tracepoint.c @@ -181,7 +181,8 @@ static int tracepoint_add_func(struct tracepoint *tp, if (tp->regfunc && !static_key_enabled(&tp->key)) tp->regfunc(); - tp_funcs = tp->funcs; + tp_funcs = rcu_dereference_protected(tp->funcs, + lockdep_is_held(&tracepoints_mutex)); old = func_add(&tp_funcs, func); if (IS_ERR(old)) { WARN_ON_ONCE(1); @@ -213,7 +214,8 @@ static int tracepoint_remove_func(struct tracepoint *tp, { struct tracepoint_func *old, *tp_funcs; - tp_funcs = tp->funcs; + tp_funcs = rcu_dereference_protected(tp->funcs, + lockdep_is_held(&tracepoints_mutex)); old = func_remove(&tp_funcs, func); if (IS_ERR(old)) { WARN_ON_ONCE(1); |