linux-kernel - Re: [PATCH 04/10] perf/uprobe: RCU-ify find

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Message-ID: <20240709150205.GO27299@noisy.programming.kicks-ass.net>
Date: Tue, 9 Jul 2024 17:02:05 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Oleg Nesterov <oleg@...hat.com>
Cc: mingo@...nel.org, andrii@...nel.org, linux-kernel@...r.kernel.org,
	rostedt@...dmis.org, mhiramat@...nel.org, jolsa@...nel.org,
	clm@...a.com, paulmck@...nel.org
Subject: Re: [PATCH 04/10] perf/uprobe: RCU-ify find_uprobe()

On Tue, Jul 09, 2024 at 04:32:55PM +0200, Oleg Nesterov wrote:

> Once guard(srcu)(&uprobes_srcu) in handle_swbp() drops the uprobes_srcu lock,
> utask->active_uprobe can be freed.

Yeah, I've fixed all those already. It's a bit of churn, adding
inc_not_zero all over the place and then removing it again, but yeah, it
makes the individual patches better.

Let me finish the complete set and I'll push out.