linux-kernel - Re: [PATCH v13 13/14] unwind_user/x86: Enable frame pointer unwinding on x86

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Message-ID: <20250711121132.5c270cfa@batman.local.home>
Date: Fri, 11 Jul 2025 12:11:32 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: David Laight <david.laight.linux@...il.com>
Cc: Steven Rostedt <rostedt@...nel.org>, linux-kernel@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org, bpf@...r.kernel.org, x86@...nel.org,
 Masami Hiramatsu <mhiramat@...nel.org>, Mathieu Desnoyers
 <mathieu.desnoyers@...icios.com>, Josh Poimboeuf <jpoimboe@...nel.org>,
 Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...nel.org>, Jiri
 Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>, Thomas
 Gleixner <tglx@...utronix.de>, Andrii Nakryiko <andrii@...nel.org>, Indu
 Bhagat <indu.bhagat@...cle.com>, "Jose E. Marchesi" <jemarch@....org>, Beau
 Belgrave <beaub@...ux.microsoft.com>, Jens Remus <jremus@...ux.ibm.com>,
 Linus Torvalds <torvalds@...ux-foundation.org>, Andrew Morton
 <akpm@...ux-foundation.org>, Jens Axboe <axboe@...nel.dk>, Florian Weimer
 <fweimer@...hat.com>, Sam James <sam@...too.org>
Subject: Re: [PATCH v13 13/14] unwind_user/x86: Enable frame pointer
 unwinding on x86

On Fri, 11 Jul 2025 09:43:21 +0100
David Laight <david.laight.linux@...il.com> wrote:

> On Mon, 07 Jul 2025 21:22:52 -0400
> Steven Rostedt <rostedt@...nel.org> wrote:
> 
> > From: Josh Poimboeuf <jpoimboe@...nel.org>
> > 
> > Use ARCH_INIT_USER_FP_FRAME to describe how frame pointers are unwound
> > on x86, and enable CONFIG_HAVE_UNWIND_USER_FP accordingly so the
> > unwind_user interfaces can be used.  
> 
> How is that going to work?
> Pretty much all x86 userspace is compiled with bp as a general
> purpose register not a frame pointer.

Which is where this patch set comes in...

  https://lore.kernel.org/linux-trace-kernel/20250701184939.026626626@goodmis.org

-- Steve