linux-kernel - Re: [RFC PATCH 24/32] x86/ftrace: Enable HAVE_FUNCTION_GRAPH

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Date:   Mon, 6 Nov 2023 13:52:43 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Florent Revest <revest@...omium.org>,
        linux-trace-kernel@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        bpf <bpf@...r.kernel.org>, Sven Schnelle <svens@...ux.ibm.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alan Maguire <alan.maguire@...cle.com>,
        Mark Rutland <mark.rutland@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Guo Ren <guoren@...nel.org>
Subject: Re: [RFC PATCH 24/32] x86/ftrace: Enable HAVE_FUNCTION_GRAPH_FREGS

On Mon, Nov 06, 2023 at 09:47:08PM +0900, Masami Hiramatsu wrote:
> On Mon, 6 Nov 2023 11:19:32 +0100
> Peter Zijlstra <peterz@...radead.org> wrote:
> 
> > On Mon, Nov 06, 2023 at 09:38:50AM +0900, Masami Hiramatsu wrote:
> > > On Sun, 5 Nov 2023 18:34:09 -0500
> > > Steven Rostedt <rostedt@...dmis.org> wrote:
> > > 
> > > > On Sun, 5 Nov 2023 18:33:01 -0500
> > > > Steven Rostedt <rostedt@...dmis.org> wrote:
> > > > 
> > > > > For x86_64, that would be:
> > > > > 
> > > > >   rdi, rsi, rdx, r8, r9, rsp
> > > > 
> > > > I missed rcx.
> > > 
> > > I would like to add rax to the list so that it can handle the return value too. :)
> > 
> > So something like so?
> > 
> > 
> > diff --git a/arch/x86/include/asm/ftrace.h b/arch/x86/include/asm/ftrace.h
> > index 897cf02c20b1..71bfe27594a5 100644
> > --- a/arch/x86/include/asm/ftrace.h
> > +++ b/arch/x86/include/asm/ftrace.h
> > @@ -36,6 +36,10 @@ static inline unsigned long ftrace_call_adjust(unsigned long addr)
> >  
> >  #ifdef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS
> >  struct ftrace_regs {
> > +	/*
> > +	 * Partial, filled with:
> > +	 *  rax, rcx, rdx, rdi, rsi, r8, r9, rsp
> 
> Don't we need rbp too? (for frame pointer)

/me goes stare at ftrace_64.S, and yes it appears it fills out rbp too.