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

[Alexei Starovoitov]

On Mon, Aug 15, 2022 at 8:44 AM Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:
>
> On Mon, 15 Aug 2022 08:35:53 -0700
> Alexei Starovoitov <alexei.starovoitov@xxxxxxxxx> wrote:
>
> > > 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?
>
> The dispatcher is already in the kernel so it's too late to complain about
> it. Jiri's patch (with my extensions) will hopefully fix the breakage BPF
> did to ftrace.
>
> My ask now is to be more inclusive when doing anything that deals with
> modification of text, or other infrastructures. This "go it alone" approach
> really needs to stop. Linux is an open source project and collaboration is
> key. I know you don't care about others use cases (as you told me in that
> BPF meeting last year), but any maintainer in the Linux kernel must care
> about the use case of others or this will all fail.

Please don't misrepresent. Not cool.