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ftrace: move sysctl_ftrace_enabled to ftrace.c

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This moves ftrace_enabled to trace/ftrace.c.

We move sysctls to places where features actually belong to improve
the readability of the code and reduce the risk of code merge conflicts.
At the same time, the proc-sysctl maintainers do not want to know what
sysctl knobs you wish to add for your owner piece of code, we just care
about the core logic.

Signed-off-by: Wei Xiao <xiaowei66@huawei.com>
Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
This commit is contained in:
Wei Xiao
2022-02-23 19:11:53 +08:00
committed by Luis Chamberlain
parent d772cc2c32
commit 8e4e83b227
3 changed files with 21 additions and 13 deletions
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3
include/linux/ftrace.h
View File

@@ -101,9 +101,6 @@ static inline int ftrace_mod_get_kallsym(unsigned int symnum, unsigned long *val
#ifdef CONFIG_FUNCTION_TRACER #ifdef CONFIG_FUNCTION_TRACER
extern int ftrace_enabled; extern int ftrace_enabled;
extern int
ftrace_enable_sysctl(struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos);
#ifndef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS #ifndef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS

9
kernel/sysctl.c
View File

@@ -1751,15 +1751,6 @@ static struct ctl_table kern_table[] = {
.proc_handler = proc_dointvec, .proc_handler = proc_dointvec,
}, },
#endif #endif
#ifdef CONFIG_FUNCTION_TRACER
{
.procname = "ftrace_enabled",
.data = &ftrace_enabled,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = ftrace_enable_sysctl,
},
#endif
#ifdef CONFIG_STACK_TRACER #ifdef CONFIG_STACK_TRACER
{ {
.procname = "stack_tracer_enabled", .procname = "stack_tracer_enabled",

22
kernel/trace/ftrace.c
View File

@@ -7921,7 +7921,8 @@ static bool is_permanent_ops_registered(void)
return false; return false;
} }
int #ifdef CONFIG_SYSCTL
static int
ftrace_enable_sysctl(struct ctl_table *table, int write, ftrace_enable_sysctl(struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos) void *buffer, size_t *lenp, loff_t *ppos)
{ {
@@ -7964,3 +7965,22 @@ ftrace_enable_sysctl(struct ctl_table *table, int write,
mutex_unlock(&ftrace_lock); mutex_unlock(&ftrace_lock);
return ret; return ret;
} }
static struct ctl_table ftrace_sysctls[] = {
{
.procname = "ftrace_enabled",
.data = &ftrace_enabled,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = ftrace_enable_sysctl,
},
{}
};
static int __init ftrace_sysctl_init(void)
{
register_sysctl_init("kernel", ftrace_sysctls);
return 0;
}
late_initcall(ftrace_sysctl_init);
#endif