linux-kernel - Re: [PATCH] parisc: select FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION

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Message-ID: <CABCJKufAXX-jsfsdHgrOhvc7SCr3T4aT4TBuf1JpedLFu-VUcQ@mail.gmail.com>
Date:   Wed, 24 Feb 2021 14:53:43 -0800
From:   Sami Tolvanen <samitolvanen@...gle.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Kees Cook <keescook@...omium.org>,
        "James E.J. Bottomley" <James.Bottomley@...senpartnership.com>,
        Helge Deller <deller@....de>,
        "Steven Rostedt (VMware)" <rostedt@...dmis.org>,
        linux-parisc@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] parisc: select FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY

On Wed, Feb 24, 2021 at 2:46 PM Guenter Roeck <linux@...ck-us.net> wrote:
>
> On Wed, Feb 24, 2021 at 01:02:27PM -0800, Kees Cook wrote:
> > On Wed, Feb 24, 2021 at 12:59:38PM -0800, Sami Tolvanen wrote:
> > > parisc uses -fpatchable-function-entry with dynamic ftrace, which means we
> > > don't need recordmcount. Select FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY
> > > to tell that to the build system.
> > >
> > > Reported-by: Guenter Roeck <linux@...ck-us.net>
> > > Fixes: 3b15cdc15956 ("tracing: move function tracer options to Kconfig")
> > > Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>
> >
> > I've got parisc building now, and can confirm:
> >
> > Tested-by: Kees Cook <keescook@...omium.org>
> >
> > Guenter, does this fix it for you too?
> >
>
> I get this:
>
> WARNING: unmet direct dependencies detected for FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY
>   Depends on [n]: TRACING_SUPPORT [=y] && FTRACE [=y] && FTRACE_MCOUNT_RECORD [=n]
>   Selected by [y]:
>   - PARISC [=y] && HAVE_DYNAMIC_FTRACE [=y]
>
> when trying to build parisc:defconfig.
>
> I think it should be
>
>         select FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY if DYNAMIC_FTRACE
>
> (no HAVE_)

Ah, it depends on FTRACE_MCOUNT_RECORD. Thanks for testing. I'll send v2.

Sami