linux-kernel - Re: [RFC][PATCH 3/5] kprobes: Take get_online_cpus() before taking jump_label

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Message-ID: <20170512144402.4611a5ef@gandalf.local.home>
Date:   Fri, 12 May 2017 14:44:02 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:     linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Masami Hiramatsu <mhiramat@...nel.org>
Subject: Re: [RFC][PATCH 3/5] kprobes: Take get_online_cpus() before taking
 jump_label_lock()

On Fri, 12 May 2017 11:39:11 -0700
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> wrote:

> On Fri, May 12, 2017 at 01:15:47PM -0400, Steven Rostedt wrote:
> > From: "Steven Rostedt (VMware)" <rostedt@...dmis.org>
> > 
> > jump_label_lock() is taken under get_online_cpus(). Make sure that kprobes
> > follows suit.
> > 
> > Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>  
> 
> The remaining three (3/5 through 5/5) look straightforward.  #4 appears
> to be the one needing the recursive get_online_cpus().

In deed it is.

Thanks for looking at these.

-- Steve