linux-kernel - Re: [PATCH] selftests/ftrace: Disable multiple

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Date:   Tue, 5 Jan 2021 23:41:37 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
Cc:     linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
        shuah@...nel.org
Subject: Re: [PATCH] selftests/ftrace: Disable multiple_kprobes test on
 powerpc

On Tue, 05 Jan 2021 15:42:44 +0530
"Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com> wrote:

> Masami Hiramatsu wrote:
> > On Tue,  5 Jan 2021 12:27:30 +0530
> > "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com> wrote:
> > 
> >> Not all symbols are blacklisted on powerpc. Disable multiple_kprobes
> >> test until that is sorted, so that rest of ftrace and kprobe selftests
> >> can be run.
> > 
> > This looks good to me, but could you try to find the functions
> > which should be blocked from kprobes?
> > (Usually, the function which are involved in the sw-breakpoint
> >  handling, including locks etc.)
> 
> Yes, we did add several blacklists some time back, but there has been 
> quite a bit of churn in our entry code. I've been meaning to audit it 
> for a while now, but this has been blocking tests. It would be nice to 
> skip this test for now until I am able to spend some time on this.

OK, But for revisiting this testcase in the future, I think it should
return UNTESTED instead of UNSUPPORTED.

Thank you,


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