linux-kernel - Re: [PATCH] perf callchain: Fix suspicious RCU usage in get_callchain

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Message-Id: <20260128084538.1889001-1-wangqing7171@gmail.com>
Date: Wed, 28 Jan 2026 16:45:38 +0800
From: Qing Wang <wangqing7171@...il.com>
To: chen.dylane@...il.com
Cc: acme@...nel.org,
	adrian.hunter@...el.com,
	alexander.shishkin@...ux.intel.com,
	andrii.nakryiko@...il.com,
	bpf@...r.kernel.org,
	irogers@...gle.com,
	jolsa@...nel.org,
	linux-kernel@...r.kernel.org,
	linux-perf-users@...r.kernel.org,
	mark.rutland@....com,
	mingo@...hat.com,
	namhyung@...nel.org,
	peterz@...radead.org,
	radoslaw.zielonek@...il.com,
	syzbot+72a43cdb78469f7fbad1@...kaller.appspotmail.com,
	wangqing7171@...il.com
Subject: Re: [PATCH] perf callchain: Fix suspicious RCU usage in get_callchain_entry()

On Wed, 28 Jan 2026 at 16:19, Tao Chen <chen.dylane@...il.com> wrote:
> I have a change that will remove RCU. As Andrii pointed out, using 
> get_callchain_entry without RCU lock in BPF appears to be safe for now. 
> Please point out if I've missed anything.

Oh, that's a great way. Thank you for reminding me.

--
Best regards,
Qing