linux-kernel - Re: [RESEND][PATCH v15 0/4] perf: Support the deferred unwinding infrastructure

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Message-ID: <20250921190956.0709dfff@batman.local.home>
Date: Sun, 21 Sep 2025 19:33:40 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Josh Poimboeuf <jpoimboe@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>, 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>, Ingo Molnar <mingo@...nel.org>, Jiri Olsa
 <jolsa@...nel.org>, Arnaldo Carvalho de Melo <acme@...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>,
 Florian Weimer <fweimer@...hat.com>, Sam James <sam@...too.org>, Kees Cook
 <kees@...nel.org>, Carlos O'Donell <codonell@...hat.com>
Subject: Re: [RESEND][PATCH v15 0/4] perf: Support the deferred unwinding
 infrastructure

On Fri, 19 Sep 2025 16:34:02 -0700
Josh Poimboeuf <jpoimboe@...nel.org> wrote:

> > That does look like that would work as the way I expected task_work to
> > handle this case.  
> 
> BTW, I remember Peter had a fix for TWA_NMI_CURRENT, I guess it got lost
> in the shuffle or did something else happen in the meantime?
> 
>   https://lore.kernel.org/20250122124228.GO7145@noisy.programming.kicks-ass.net

Yeah, it did get lost in the shuffle. I took the code from your git
tree, but missed the comments that were made to the patches you sent to
the mailing list. :-p

Thanks for pointing this out!

-- Steve