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Message-ID: <20250708092351.4548c613@gandalf.local.home>
Date: Tue, 8 Jul 2025 09:23:51 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
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>,
 Andrew Morton <akpm@...ux-foundation.org>, Jens Axboe <axboe@...nel.dk>,
 Florian Weimer <fweimer@...hat.com>, Sam James <sam@...too.org>
Subject: Re: [PATCH v8 10/12] unwind_user/sframe: Enable debugging in
 uaccess regions

On Mon, 7 Jul 2025 20:38:35 -0700
Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> On Mon, 7 Jul 2025 at 19:12, Steven Rostedt <rostedt@...nel.org> wrote:

> This patch is disgusting, in other words. It's wrong. STOP IT.
> 

No problem, I can easily drop it.

I just took Josh's PoC patches and posted them. This particular series
still needs a bit of work. That's one of the reasons I split it out of the
other series. The core series is at the stage for acceptance and looking
for feedback from other maintainers. This series is still a work in
progress. Others have asked me to post them so they can start playing with
it.

We still need to come up with a system call with a robust API to allow the
dynamic linker to tell the kernel where the SFrames are for the libraries
it loads. Hence the "DO NOT APPLY" patch at the end (which I just noticed the
subject text got dropped when I pulled it into git from patchwork and sent
out this version, at least the change long still suggest it shouldn't be
applied).

But I will remove this patch from the queue. I never even used this
debugging. What I did was inject trace_printk() all over the place to make
sure it was working as expected.

Thanks,

-- Steve

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