From: Steven Rostedt <rostedt@goodmis.org>
To: "Fusheng Huang(黄富生)" <Fusheng.Huang@luxshare-ict.com>
Cc: "mhiramat@kernel.org" <mhiramat@kernel.org>,
"GuoJin Dai( 戴国金)" <GuoJin.Dai@luxshare-ict.com>,
"linux-trace-kernel@vger.kernel.org"
<linux-trace-kernel@vger.kernel.org>
Subject: Re: 【ftrace_events list】race between trace_event_eval_update and __register_event discuss
Date: Thu, 17 Jul 2025 10:59:58 -0400 [thread overview]
Message-ID: <20250717105958.7e8c51b6@batman.local.home> (raw)
In-Reply-To: <20250717105007.46ccd18f@batman.local.home>
On Thu, 17 Jul 2025 10:50:07 -0400
Steven Rostedt <rostedt@goodmis.org> wrote:
> > __register_event(inline)
> > |...
> > |+++down_write(&trace_event_sem);
> > |
> > |---list_add(&call->list, &ftrace_events);
> > |
> > |+++down_up(&trace_event_sem);
> > |...
Yeah, I think this may need to be the patch, as __register_event() also
calls event_init() that eventually takes the semaphore :-p
I think there may need to be other places that need that protection, so
I'll go and see if I can find and add them all.
-- Steve
prev parent reply other threads:[~2025-07-17 15:00 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <3c1259275c784bbd9e2f33e1b2d846c1@luxshare-ict.com>
2025-07-17 14:50 ` 【ftrace_events list】race between trace_event_eval_update and __register_event discuss Steven Rostedt
2025-07-17 14:52 ` Steven Rostedt
2025-07-17 14:59 ` Steven Rostedt [this message]
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