linux-kernel - Re: [PATCH v17 02/16] function_graph: Replace fgraph_ret_regs with ftrace

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Message-Id: <20241023175843.e1f92bb25e9f65a4e3ff2861@kernel.org>
Date: Wed, 23 Oct 2024 17:58:43 +0900
From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
To: Will Deacon <will@...nel.org>
Cc: Alexei Starovoitov <alexei.starovoitov@...il.com>, Steven Rostedt
 <rostedt@...dmis.org>, 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>, Alexei
 Starovoitov <ast@...nel.org>, Jiri Olsa <jolsa@...nel.org>, Alan Maguire
 <alan.maguire@...cle.com>, Mark Rutland <mark.rutland@....com>,
 linux-arch@...r.kernel.org, Heiko Carstens <hca@...ux.ibm.com>, Catalin
 Marinas <catalin.marinas@....com>, Huacai Chen <chenhuacai@...nel.org>,
 WANG Xuerui <kernel@...0n.name>, Paul Walmsley <paul.walmsley@...ive.com>,
 Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>,
 Vasily Gorbik <gor@...ux.ibm.com>, Alexander Gordeev
 <agordeev@...ux.ibm.com>, Christian Borntraeger
 <borntraeger@...ux.ibm.com>, Sven Schnelle <svens@...ux.ibm.com>, Thomas
 Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav
 Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>,
 x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>, Mathieu Desnoyers
 <mathieu.desnoyers@...icios.com>
Subject: Re: [PATCH v17 02/16] function_graph: Replace fgraph_ret_regs with
 ftrace_regs

On Mon, 21 Oct 2024 17:46:58 +0100
Will Deacon <will@...nel.org> wrote:

> On Wed, Oct 16, 2024 at 09:58:09AM +0900, Masami Hiramatsu (Google) wrote:
> > From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
> > 
> > Use ftrace_regs instead of fgraph_ret_regs for tracing return value
> > on function_graph tracer because of simplifying the callback interface.
> > 
> > The CONFIG_HAVE_FUNCTION_GRAPH_RETVAL is also replaced by
> > CONFIG_HAVE_FUNCTION_GRAPH_FREGS.
> > 
> > Signed-off-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
> > Acked-by: Heiko Carstens <hca@...ux.ibm.com>
> > Cc: Catalin Marinas <catalin.marinas@....com>
> > Cc: Will Deacon <will@...nel.org>
> > Cc: Steven Rostedt <rostedt@...dmis.org>
> > Cc: Mark Rutland <mark.rutland@....com>
> > Cc: Huacai Chen <chenhuacai@...nel.org>
> > Cc: WANG Xuerui <kernel@...0n.name>
> > Cc: Paul Walmsley <paul.walmsley@...ive.com>
> > Cc: Palmer Dabbelt <palmer@...belt.com>
> > Cc: Albert Ou <aou@...s.berkeley.edu>
> > Cc: Vasily Gorbik <gor@...ux.ibm.com>
> > Cc: Alexander Gordeev <agordeev@...ux.ibm.com>
> > Cc: Heiko Carstens <hca@...ux.ibm.com>
> > Cc: Christian Borntraeger <borntraeger@...ux.ibm.com>
> > Cc: Sven Schnelle <svens@...ux.ibm.com>
> > Cc: Thomas Gleixner <tglx@...utronix.de>
> > Cc: Ingo Molnar <mingo@...hat.com>
> > Cc: Borislav Petkov <bp@...en8.de>
> > Cc: Dave Hansen <dave.hansen@...ux.intel.com>
> > Cc: x86@...nel.org
> > Cc: "H. Peter Anvin" <hpa@...or.com>
> > Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
> > 
> > ---
> >  Changes in v17:
> >   - Fixes s390 return_to_handler according to Heiko's advice.
> >  Changes in v16:
> >   - According to the recent ftrace_regs.h change, override
> >     ftrace_regs_get_frame_pointer() if needed.
> >   - s390: keep stack_frame on stack, just replace fgraph_ret_regs
> >     with ftrace_regs.
> >  Changes in v8:
> >   - Newly added.
> > ---
> >  arch/arm64/Kconfig                  |    1 +
> >  arch/arm64/include/asm/ftrace.h     |   23 ++++++-----------------
> >  arch/arm64/kernel/asm-offsets.c     |   12 ------------
> >  arch/arm64/kernel/entry-ftrace.S    |   32 ++++++++++++++++++--------------
> 
> For the arm64 parts:
> 
> Acked-by: Will Deacon <will@...nel.org>

Thank you!

> 
> Will

-- 
Masami Hiramatsu (Google) <mhiramat@...nel.org>