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ftrace: Nuke clear_ftrace_function

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clear_ftrace_function is not used outside of ftrace.c and is not help to
use a function, so nuke it per Steve's suggestion.

Link: http://lkml.kernel.org/r/1517537689-34947-1-git-send-email-xieyisheng1@huawei.com

Suggested-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Yisheng Xie <xieyisheng1@huawei.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Yisheng Xie 2018-02-02 10:14:49 +08:00 • committed by Steven Rostedt (VMware)
parent 26b68dd2f4
commit 5ccba64a56
2 changed files with 1 additions and 14 deletions
Download patch file Download diff file Expand all files Collapse all files

2
include/linux/ftrace.h
View file

@ -223,7 +223,6 @@ extern enum ftrace_tracing_type_t ftrace_tracing_type;
*/ */
int register_ftrace_function(struct ftrace_ops *ops); int register_ftrace_function(struct ftrace_ops *ops);
int unregister_ftrace_function(struct ftrace_ops *ops); int unregister_ftrace_function(struct ftrace_ops *ops);
void clear_ftrace_function(void);
extern void ftrace_stub(unsigned long a0, unsigned long a1, extern void ftrace_stub(unsigned long a0, unsigned long a1,
struct ftrace_ops *op, struct pt_regs *regs); struct ftrace_ops *op, struct pt_regs *regs);
@ -239,7 +238,6 @@ static inline int ftrace_nr_registered_ops(void)
{ {
return 0; return 0;
} }
static inline void clear_ftrace_function(void) { }
static inline void ftrace_kill(void) { } static inline void ftrace_kill(void) { }
static inline void ftrace_free_init_mem(void) { } static inline void ftrace_free_init_mem(void) { }
static inline void ftrace_free_mem(struct module *mod, void *start, void *end) { } static inline void ftrace_free_mem(struct module *mod, void *start, void *end) { }

13
kernel/trace/ftrace.c
View file

@ -192,17 +192,6 @@ static void ftrace_pid_func(unsigned long ip, unsigned long parent_ip,
op->saved_func(ip, parent_ip, op, regs); op->saved_func(ip, parent_ip, op, regs);
} }
/**
* clear_ftrace_function - reset the ftrace function
*
* This NULLs the ftrace function and in essence stops
* tracing. There may be lag
*/
void clear_ftrace_function(void)
{
ftrace_trace_function = ftrace_stub;
}
static void ftrace_sync(struct work_struct *work) static void ftrace_sync(struct work_struct *work)
{ {
/* /*
@ -6689,7 +6678,7 @@ void ftrace_kill(void)
{ {
ftrace_disabled = 1; ftrace_disabled = 1;
ftrace_enabled = 0; ftrace_enabled = 0;
clear_ftrace_function(); ftrace_trace_function = ftrace_stub;
} }
/** /**