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ftrace: Have unregister_ftrace_function_probe_func() return a value

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Currently unregister_ftrace_function_probe_func() is a void function. It
does not give any feedback if an error occurred or no item was found to
remove and nothing was done.

Change it to return status and success if it removed something. Also update
the callers to return that feedback to the user.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (VMware) 2017-04-04 16:44:43 -04:00
parent e16b35ddb8
commit d3d532d798
5 changed files with 17 additions and 14 deletions
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14
kernel/trace/ftrace.c
View File

@ -4102,7 +4102,7 @@ register_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops,
return count;
}
void
int
unregister_ftrace_function_probe_func(char *glob, struct ftrace_probe_ops *ops)
{
struct ftrace_ops_hash old_hash_ops;
@ -4131,7 +4131,7 @@ unregister_ftrace_function_probe_func(char *glob, struct ftrace_probe_ops *ops)
/* we do not support '!' for function probes */
if (WARN_ON(not))
return;
return -EINVAL;
}
mutex_lock(&trace_probe_ops.func_hash->regex_lock);
@ -4140,9 +4140,9 @@ unregister_ftrace_function_probe_func(char *glob, struct ftrace_probe_ops *ops)
/* Probes only have filters */
old_hash_ops.notrace_hash = NULL;
ret = -ENOMEM;
hash = alloc_and_copy_ftrace_hash(FTRACE_HASH_DEFAULT_BITS, *orig_hash);
if (!hash)
/* Hmm, should report this somehow */
goto out_unlock;
INIT_LIST_HEAD(&free_list);
@ -4173,6 +4173,13 @@ unregister_ftrace_function_probe_func(char *glob, struct ftrace_probe_ops *ops)
list_add(&entry->free_list, &free_list);
}
}
/* Nothing found? */
if (list_empty(&free_list)) {
ret = -EINVAL;
goto out_unlock;
}
mutex_lock(&ftrace_lock);
disabled = __disable_ftrace_function_probe();
/*
@ -4198,6 +4205,7 @@ unregister_ftrace_function_probe_func(char *glob, struct ftrace_probe_ops *ops)
out_unlock:
mutex_unlock(&trace_probe_ops.func_hash->regex_lock);
free_ftrace_hash(hash);
return ret;
}
static LIST_HEAD(ftrace_commands);

6
kernel/trace/trace.c
View File

@ -6829,10 +6829,8 @@ ftrace_trace_snapshot_callback(struct ftrace_hash *hash,
ops = param ? &snapshot_count_probe_ops : &snapshot_probe_ops;
if (glob[0] == '!') {
unregister_ftrace_function_probe_func(glob+1, ops);
return 0;
}
if (glob[0] == '!')
return unregister_ftrace_function_probe_func(glob+1, ops);
if (!param)
goto out_reg;

2
kernel/trace/trace.h
View File

@ -963,7 +963,7 @@ void free_ftrace_func_mapper(struct ftrace_func_mapper *mapper,
extern int
register_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops,
void *data);
extern void
extern int
unregister_ftrace_function_probe_func(char *glob, struct ftrace_probe_ops *ops);
int register_ftrace_command(struct ftrace_func_command *cmd);

3
kernel/trace/trace_events.c
View File

@ -2652,8 +2652,7 @@ event_enable_func(struct ftrace_hash *hash,
ops = param ? &event_disable_count_probe_ops : &event_disable_probe_ops;
if (glob[0] == '!') {
unregister_ftrace_function_probe_func(glob+1, ops);
ret = 0;
ret = unregister_ftrace_function_probe_func(glob+1, ops);
goto out;
}

6
kernel/trace/trace_functions.c
View File

@ -586,10 +586,8 @@ ftrace_trace_probe_callback(struct ftrace_probe_ops *ops,
if (!enable)
return -EINVAL;
if (glob[0] == '!') {
unregister_ftrace_function_probe_func(glob+1, ops);
return 0;
}
if (glob[0] == '!')
return unregister_ftrace_function_probe_func(glob+1, ops);
if (!param)
goto out_reg;