Re: [PATCH v4 bpf-next 2/4] ftrace: allow IPMODIFY and DIRECT ops on the same function

[Steven Rostedt <rostedt@xxxxxxxxxxx>]

On Tue, 19 Jul 2022 23:24:35 +0000
Song Liu <songliubraving@xxxxxx> wrote:

> Actually, we cannot blindly lock direct_mutex here, as 
> register_ftrace_direct() already locks it before calling 
> register_ftrace_function(). We still need the if (IPMODIFY)
> check. 

Let's not play games with this then.

Create a register_ftrace_function_nolock()

and use that for register_ftrace_direct().

Otherwise it's going to be a nightmare to keep track of.

-- Steve