From: Guenter Roeck <linux@roeck-us.net>
To: Kees Cook <keescook@chromium.org>
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 14:46:34 -0800 [thread overview]
Message-ID: <20210224224634.GC74404@roeck-us.net> (raw)
In-Reply-To: <202102241301.226812E88@keescook>
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_)
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
next prev parent reply other threads:[~2021-02-24 22:47 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 [this message]
2021-02-24 22:53 ` Sami Tolvanen
2021-02-24 22:54 ` Kees Cook
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