linux-kernel - Re: [PATCH -v5 05/17] x86/ftrace: Use text

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Date:   Thu, 14 Nov 2019 15:05:49 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org, mhiramat@...nel.org,
        bristot@...hat.com, jbaron@...mai.com,
        torvalds@...ux-foundation.org, tglx@...utronix.de,
        mingo@...nel.org, namit@...are.com, hpa@...or.com, luto@...nel.org,
        ard.biesheuvel@...aro.org, jpoimboe@...hat.com, jeyu@...nel.org,
        alexei.starovoitov@...il.com
Subject: Re: [PATCH -v5 05/17] x86/ftrace: Use text_poke()

On Thu, Nov 14, 2019 at 08:56:28AM -0500, Steven Rostedt wrote:
> On Thu, 14 Nov 2019 14:18:27 +0100
> Peter Zijlstra <peterz@...radead.org> wrote:
> 
> > On Wed, Nov 13, 2019 at 09:27:41AM -0500, Steven Rostedt wrote:
> > 
> > > Yeah, let's keep it this way, but still needs a comment.  
> > 
> > The function now reads:
> > 
> > int ftrace_arch_code_modify_post_process(void)
> >     __releases(&text_mutex)
> > {
> > 	/*
> > 	 * ftrace_module_enable()
> > 	 *   ftrace_arch_code_modify_prepare()
> > 	 *   do_for_each_ftrace_rec()
> > 	 *     __ftrace_replace_code()
> > 	 *       ftrace_make_{call,nop}()
> > 	 *         ftrace_modify_code_direct()
> > 	 *           text_poke_queue()
> > 	 *   ftrace_arch_code_modify_post_process()
> > 	 *     text_poke_finish()
> 
> Perhaps just:
> 
> 	/*
> 	 * ftrace_make_{call,nop}() may be called during
> 	 * module load, and we need to finish the text_poke_queue()
> 	 * that they do, here.
> > 	 */
> 
> 
> > 	text_poke_finish();
> > 	ftrace_poke_late = 0;
> > 	mutex_unlock(&text_mutex);
> > 	return 0;
> > }
> > 
> > Patch is otherwise unchanged.
> 
> Other than that:
> 
> Reviewed-by: Steven Rostedt (VMware) <rostedt@...dmis.org>

Done and thanks!