linux-kernel - Re: [External] [PATCH 0/2] bpf, x86/unwind/orc: Support reliable unwinding through BPF stack frames

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Message-ID: <3kyieolhgh3snk64zd6u6f5p4qopffzunfwdkx4crmcvewbfkr@utv2dccmybxw>
Date: Tue, 2 Dec 2025 14:07:42 -0800
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: Andrey Grodzovsky <andrey.grodzovsky@...wdstrike.com>
Cc: x86@...nel.org, linux-kernel@...r.kernel.org, 
	live-patching@...r.kernel.org, bpf@...r.kernel.org, Petr Mladek <pmladek@...e.com>, 
	Song Liu <song@...nel.org>, Raja Khan <raja.khan@...wdstrike.com>, 
	Miroslav Benes <mbenes@...e.cz>, Alexei Starovoitov <ast@...nel.org>, 
	Daniel Borkmann <daniel@...earbox.net>, Andrii Nakryiko <andrii@...nel.org>, 
	Peter Zijlstra <peterz@...radead.org>, DL Linux Open Source Team <linux-open-source@...wdstrike.com>
Subject: Re: [External] [PATCH 0/2] bpf, x86/unwind/orc: Support reliable
 unwinding through BPF stack frames

On Tue, Dec 02, 2025 at 03:56:26PM -0500, Andrey Grodzovsky wrote:
> On 12/2/25 13:19, Josh Poimboeuf wrote:
> > Fix livepatch stalls which may be seen when a task is blocked with BPF
> > JIT on its kernel stack.
> > 
> > Josh Poimboeuf (2):
> >    bpf: Add bpf_has_frame_pointer()
> >    x86/unwind/orc: Support reliable unwinding through BPF stack frames
> > 
> >   arch/x86/kernel/unwind_orc.c | 39 +++++++++++++++++++++++++-----------
> >   arch/x86/net/bpf_jit_comp.c  | 10 +++++++++
> >   include/linux/bpf.h          |  3 +++
> >   kernel/bpf/core.c            | 16 +++++++++++++++
> >   4 files changed, 56 insertions(+), 12 deletions(-)
> > 
> 
> 
> Acked-and-tested-by: Andrey Grodzovsky<andrey.grodzovsky@...wdstrike.com>
> 
> Question - This looks to be x86 specific issue since ORC unwinding is x86
> specific and as such this has no impact on ARM, correct ?

Correct, though if ARM ever switches to sframe for in-kernel unwinding,
it might also want to use this interface.

-- 
Josh