linux-kernel - Re: [PATCH v1 0/5] Implement livepatch on PPC32

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Message-ID: <20211214090148.264f4660@gandalf.local.home>
Date:   Tue, 14 Dec 2021 09:01:48 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     Josh Poimboeuf <jpoimboe@...hat.com>,
        Jiri Kosina <jikos@...nel.org>,
        Miroslav Benes <mbenes@...e.cz>,
        Petr Mladek <pmladek@...e.com>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        Ingo Molnar <mingo@...hat.com>,
        "Naveen N . Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "live-patching@...r.kernel.org" <live-patching@...r.kernel.org>,
        "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>
Subject: Re: [PATCH v1 0/5] Implement livepatch on PPC32

On Tue, 14 Dec 2021 08:35:14 +0100
Christophe Leroy <christophe.leroy@...roup.eu> wrote:

> > Will continue investigating.
> >   
> 
> trace_selftest_startup_function_graph() calls register_ftrace_direct() 
> which returns -ENOSUPP because powerpc doesn't select 
> CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS.
> 
> Should TEST_DIRECT_TRAMP depend on CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS ?

Yes, that should be:

#if defined(CONFIG_DYNAMIC_FTRACE) && \
    defined(CONFIG_HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS)
#define TEST_DIRECT_TRAMP
noinline __noclone static void trace_direct_tramp(void) { }
#endif


And make it test it with or without the args.

Thanks for finding this.

-- Steve