linux-kernel - Re: [for-next][PATCH 12/16] kprobes: Initialize kprobes at postcore

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Date:   Tue, 9 Jul 2019 21:51:24 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Mark Rutland <mark.rutland@....com>,
        linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [for-next][PATCH 12/16] kprobes: Initialize kprobes at
 postcore_initcall

On Wed, 3 Jul 2019 10:25:04 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:

> On Wed, 3 Jul 2019 10:24:02 -0400
> Steven Rostedt <rostedt@...dmis.org> wrote:
> 
> > On Wed, 3 Jul 2019 15:08:32 +0100
> > Catalin Marinas <catalin.marinas@....com> wrote:
> > 
> > 
> > > > +static int __init run_init_test_probes(void)
> > > > +{
> > > > +	if (run_kprobe_tests)
> > > > +		init_test_probes();    
> > > 
> > > A return 0 here.  
> > 
> > Will update (would have triggered a failure on my test suite anyway ;-)
> > 
> > >   
> > > > +}
> > > > +module_init(run_init_test_probes);    
> > > 
> > > This does the trick. I prefer your fix as it leaves the arch code
> > > unchanged. In case you need it:
> > > 
> > > Tested-by: Catalin Marinas <catalin.marinas@....com>
> > >   
> >
> 
> Masami,
> 
> If you give me an Acked-by, I'll add it to my tree.

Sorry for late reply, but I want to keep the test running right after
initialization as the first user of kprobes at that timing, since
other user can start using kprobes right after init_kprobes().
So this issue must be fixed in moving the init_kprobes() itself
right after arch_initcall() (and that is subsys_initcall)

Catalin, Mark, could you ensure the below patch can fix your issue?

https://lore.kernel.org/lkml/20190625191545.245259106@goodmis.org/

And if so, Steve, could you push above one (which seems already in your
tree) to next as a fix?

Thank you,

-- 
Masami Hiramatsu <mhiramat@...nel.org>