Re: [PATCH v10 07/14] unwind_user/deferred: Make unwind deferral requests NMI-safe

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Subject: Re: [PATCH v10 07/14] unwind_user/deferred: Make unwind deferral requests NMI-safe
From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Date: Thu, 19 Jun 2025 12:39:51 +0200
Cc: linux-kernel@xxxxxxxxxxxxxxx, linux-trace-kernel@xxxxxxxxxxxxxxx, bpf@xxxxxxxxxxxxxxx, x86@xxxxxxxxxx, Masami Hiramatsu <mhiramat@xxxxxxxxxx>, Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>, Josh Poimboeuf <jpoimboe@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Jiri Olsa <jolsa@xxxxxxxxxx>, Namhyung Kim <namhyung@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Andrii Nakryiko <andrii@xxxxxxxxxx>, Indu Bhagat <indu.bhagat@xxxxxxxxxx>, "Jose E. Marchesi" <jemarch@xxxxxxx>, Beau Belgrave <beaub@xxxxxxxxxxxxxxxxxxx>, Jens Remus <jremus@xxxxxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
In-reply-to: <66A7F6C1-3693-4F76-A513-7CBBE3154B06@goodmis.org>

On Thu, Jun 19, 2025 at 06:19:28AM -0400, Steven Rostedt wrote:

> We currently care about x86-64, arm64, ppc 64 and s390. I'm assuming
> they all have a proper 64 bit cmpxchg.

They do. The only 64bit architecture that does not is HPPA IIRC.

Follow-Ups:
- Re: [PATCH v10 07/14] unwind_user/deferred: Make unwind deferral requests NMI-safe
  - From: Steven Rostedt

References:
- [PATCH v10 00/14] unwind_user: x86: Deferred unwinding infrastructure
  - From: Steven Rostedt
- [PATCH v10 07/14] unwind_user/deferred: Make unwind deferral requests NMI-safe
  - From: Steven Rostedt
- Re: [PATCH v10 07/14] unwind_user/deferred: Make unwind deferral requests NMI-safe
  - From: Peter Zijlstra
- Re: [PATCH v10 07/14] unwind_user/deferred: Make unwind deferral requests NMI-safe
  - From: Steven Rostedt
- Re: [PATCH v10 07/14] unwind_user/deferred: Make unwind deferral requests NMI-safe
  - From: Peter Zijlstra
- Re: [PATCH v10 07/14] unwind_user/deferred: Make unwind deferral requests NMI-safe
  - From: Steven Rostedt
- Re: [PATCH v10 07/14] unwind_user/deferred: Make unwind deferral requests NMI-safe
  - From: Peter Zijlstra
- Re: [PATCH v10 07/14] unwind_user/deferred: Make unwind deferral requests NMI-safe
  - From: Steven Rostedt

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