Re: [RFC] ftrace: Add support to keep some functions out of ftrace

Alexei Starovoitov
2022-08-15T15:36:14Z

On Mon, Aug 15, 2022 at 8:28 AM Peter Zijlstra <peterz@infradead.org> wrote:
>
> On Mon, Aug 15, 2022 at 08:17:42AM -0700, Alexei Starovoitov wrote:
> > It's hiding a fake function from ftrace, since it's not a function
> > and ftrace infra shouldn't show it tracing logs.
> > In other words it's a _notrace_ function with nop5.
>
> Then make it a notrace function with a nop5 in it. That isn't hard.

That's exactly what we're trying to do.
Jiri's patch is one way to achieve that.
What is your suggestion?
Move it from C to asm ?
Make it naked function with explicit inline asm?
What else?