bianbu-repo-mirror/bianbu-linux-6.6
1
0
Fork 0
mirror of https://gitee.com/bianbu-linux/linux-6.6 synced 2025-04-24 14:07:52 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

tracing: Enable creating new instance early boot

Browse source 
Enable creating new trace_array instance in early boot stage.
If the instances directory is not created, postpone it until
the tracefs is initialized.

Link: https://lkml.kernel.org/r/159974154763.478751.6289753509587233103.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu 2020-09-10 21:39:07 +09:00 • committed by Steven Rostedt (VMware)
parent a838deab4e
commit 4114fbfd02
3 changed files with 63 additions and 19 deletions
Download patch file Download diff file Expand all files Collapse all files

22
kernel/trace/trace_functions.c
View file

@ -34,10 +34,14 @@ enum {
TRACE_FUNC_OPT_STACK = 0x1,
};
static int allocate_ftrace_ops(struct trace_array *tr)
int ftrace_allocate_ftrace_ops(struct trace_array *tr)
{
struct ftrace_ops *ops;
/* The top level array uses the "global_ops" */
if (tr->flags & TRACE_ARRAY_FL_GLOBAL)
return 0;
ops = kzalloc(sizeof(*ops), GFP_KERNEL);
if (!ops)
return -ENOMEM;
@ -48,15 +52,19 @@ static int allocate_ftrace_ops(struct trace_array *tr)
tr->ops = ops;
ops->private = tr;
return 0;
}
void ftrace_free_ftrace_ops(struct trace_array *tr)
{
kfree(tr->ops);
tr->ops = NULL;
}
int ftrace_create_function_files(struct trace_array *tr,
struct dentry *parent)
{
int ret;
/*
* The top level array uses the "global_ops", and the files are
* created on boot up.
@ -64,9 +72,8 @@ int ftrace_create_function_files(struct trace_array *tr,
if (tr->flags & TRACE_ARRAY_FL_GLOBAL)
return 0;
ret = allocate_ftrace_ops(tr);
if (ret)
return ret;
if (!tr->ops)
return -EINVAL;
ftrace_create_filter_files(tr->ops, parent);
@ -76,8 +83,7 @@ int ftrace_create_function_files(struct trace_array *tr,
void ftrace_destroy_function_files(struct trace_array *tr)
{
ftrace_destroy_filter_files(tr->ops);
kfree(tr->ops);
tr->ops = NULL;
ftrace_free_ftrace_ops(tr);
}
static int function_trace_init(struct trace_array *tr)