linux-kernel - Re: [PATCH] kprobes, x86/alternatives: use text_mutex to protect smp_alt

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Message-ID: <20171031175928.1d1d7a6b@gandalf.local.home>
Date:   Tue, 31 Oct 2017 17:59:28 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Zhou Chengming <zhouchengming1@...wei.com>,
        Ingo Molnar <mingo@...hat.com>, <ananth@...ux.vnet.ibm.com>,
        <anil.s.keshavamurthy@...el.com>, <davem@...emloft.net>,
        <hpa@...or.com>, <tglx@...utronix.de>, <bp@...e.de>,
        <peterz@...radead.org>, <jkosina@...e.cz>, <mjurczyk@...gle.com>,
        <x86@...nel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kprobes, x86/alternatives: use text_mutex to protect
 smp_alt_modules

On Mon, 30 Oct 2017 17:03:23 +0900
Masami Hiramatsu <mhiramat@...nel.org> wrote:

> >  static LIST_HEAD(smp_alt_modules);
> > -static DEFINE_MUTEX(smp_alt);
> > -static bool uniproc_patched = false;	/* protected by smp_alt */
> > +static bool uniproc_patched = false;	/* protected by text_mutex */

We should also add a comment somewhere by the text_mutex that it is
protecting this on x86.

-- Steve