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Date: Fri, 11 Jul 2025 12:11:32 -0400
From: Steven Rostedt <rostedt@goodmis.org>
To: David Laight <david.laight.linux@gmail.com>
Cc: Steven Rostedt <rostedt@kernel.org>, linux-kernel@vger.kernel.org,
 linux-trace-kernel@vger.kernel.org, bpf@vger.kernel.org, x86@kernel.org,
 Masami Hiramatsu <mhiramat@kernel.org>, Mathieu Desnoyers
 <mathieu.desnoyers@efficios.com>, Josh Poimboeuf <jpoimboe@kernel.org>,
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 Belgrave <beaub@linux.microsoft.com>, Jens Remus <jremus@linux.ibm.com>,
 Linus Torvalds <torvalds@linux-foundation.org>, Andrew Morton
 <akpm@linux-foundation.org>, Jens Axboe <axboe@kernel.dk>, Florian Weimer
 <fweimer@redhat.com>, Sam James <sam@gentoo.org>
Subject: Re: [PATCH v13 13/14] unwind_user/x86: Enable frame pointer
 unwinding on x86
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On Fri, 11 Jul 2025 09:43:21 +0100
David Laight <david.laight.linux@gmail.com> wrote:

> On Mon, 07 Jul 2025 21:22:52 -0400
> Steven Rostedt <rostedt@kernel.org> wrote:
> 
> > From: Josh Poimboeuf <jpoimboe@kernel.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