linux-kernel - Re: [PATCH v9 01/16] tracing: move function tracer options to Kconfig (causing parisc build failures)

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Message-ID: <202102241442.C456318BC0@keescook>
Date:   Wed, 24 Feb 2021 14:42:49 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Sami Tolvanen <samitolvanen@...gle.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Will Deacon <will@...nel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        clang-built-linux@...glegroups.com,
        kernel-hardening@...ts.openwall.com, linux-arch@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-parisc@...r.kernel.org, Helge Deller <deller@....de>
Subject: Re: [PATCH v9 01/16] tracing: move function tracer options to
 Kconfig (causing parisc build failures)

On Wed, Feb 24, 2021 at 02:28:07PM -0800, Guenter Roeck wrote:
> On Wed, Feb 24, 2021 at 12:38:54PM -0800, Kees Cook wrote:
> > On Wed, Feb 24, 2021 at 12:17:23PM -0800, Guenter Roeck wrote:
> > > On Fri, Dec 11, 2020 at 10:46:18AM -0800, Sami Tolvanen wrote:
> > > > Move function tracer options to Kconfig to make it easier to add
> > > > new methods for generating __mcount_loc, and to make the options
> > > > available also when building kernel modules.
> > > > 
> > > > Note that FTRACE_MCOUNT_USE_* options are updated on rebuild and
> > > > therefore, work even if the .config was generated in a different
> > > > environment.
> > > > 
> > > > Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>
> > > > Acked-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
> > > 
> > > With this patch in place, parisc:allmodconfig no longer builds.
> > > 
> > > Error log:
> > > Arch parisc is not supported with CONFIG_FTRACE_MCOUNT_RECORD at scripts/recordmcount.pl line 405.
> > > make[2]: *** [scripts/mod/empty.o] Error 2
> > > 
> > > Due to this problem, CONFIG_FTRACE_MCOUNT_RECORD can no longer be
> > > enabled in parisc builds. Since that is auto-selected by DYNAMIC_FTRACE,
> > > DYNAMIC_FTRACE can no longer be enabled, and with it everything that
> > > depends on it.
> > 
> > Ew. Any idea why this didn't show up while it was in linux-next?
> > 
> 
> It did, I just wasn't able to bisect it there.

Ah-ha! Okay, thanks. Sorry it's been broken for so long! I've added
parisc to my local cross builder now.

-- 
Kees Cook