From: Kees Cook <keescook@chromium.org>
To: Guenter Roeck <linux@roeck-us.net>
Cc: Sami Tolvanen <samitolvanen@google.com>,
"James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>,
Helge Deller <deller@gmx.de>,
"Steven Rostedt (VMware)" <rostedt@goodmis.org>,
linux-parisc@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] parisc: select FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY
Date: Wed, 24 Feb 2021 14:54:46 -0800 [thread overview]
Message-ID: <202102241454.37C5591C7@keescook> (raw)
In-Reply-To: <20210224224634.GC74404@roeck-us.net>
On Wed, Feb 24, 2021 at 02:46:34PM -0800, Guenter Roeck 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@roeck-us.net>
> > > Fixes: 3b15cdc15956 ("tracing: move function tracer options to Kconfig")
> > > Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
> >
> > I've got parisc building now, and can confirm:
> >
> > Tested-by: Kees Cook <keescook@chromium.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_)
Yeah, that works for me with both defconfig and allmodconfig. (And that
more closely matches what's done for arm64.)
-Kees
>
> Guenter
>
> > -Kees
> >
> > > ---
> > > arch/parisc/Kconfig | 1 +
> > > 1 file changed, 1 insertion(+)
> > >
> > > diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
> > > index ecef9aff9d72..9ee806f68123 100644
> > > --- a/arch/parisc/Kconfig
> > > +++ b/arch/parisc/Kconfig
> > > @@ -60,6 +60,7 @@ config PARISC
> > > select HAVE_KPROBES
> > > select HAVE_KRETPROBES
> > > select HAVE_DYNAMIC_FTRACE if $(cc-option,-fpatchable-function-entry=1,1)
> > > + select FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY if HAVE_DYNAMIC_FTRACE
> > > select HAVE_FTRACE_MCOUNT_RECORD if HAVE_DYNAMIC_FTRACE
> > > select HAVE_KPROBES_ON_FTRACE
> > > select HAVE_DYNAMIC_FTRACE_WITH_REGS
> > >
> > > base-commit: 719bbd4a509f403f537adcaefd8ce17532be2e84
> > > --
> > > 2.30.0.617.g56c4b15f3c-goog
> > >
> >
> > --
> > Kees Cook
--
Kees Cook
prev parent reply other threads:[~2021-02-24 22:55 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-24 20:59 [PATCH] parisc: select FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY Sami Tolvanen
2021-02-24 21:02 ` Kees Cook
2021-02-24 22:46 ` Guenter Roeck
2021-02-24 22:53 ` Sami Tolvanen
2021-02-24 22:54 ` Kees Cook [this message]
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