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

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Date:   Wed, 24 Feb 2021 13:02:27 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Sami Tolvanen <samitolvanen@...gle.com>
Cc:     "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
        Helge Deller <deller@....de>,
        Guenter Roeck <linux@...ck-us.net>,
        "Steven Rostedt (VMware)" <rostedt@...dmis.org>,
        linux-parisc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] parisc: select FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY

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?

-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