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

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Message-ID: <20231106101932.GJ8262@noisy.programming.kicks-ass.net>
Date:   Mon, 6 Nov 2023 11:19:32 +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 09:38:50AM +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
+	 */
 	struct pt_regs		regs;
 };