linux-kernel - Re: [PATCH v4 06/29] tracing: move function tracer options to Kconfig

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Date:   Tue, 29 Sep 2020 20:12:57 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Sami Tolvanen <samitolvanen@...gle.com>
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        Will Deacon <will@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Kees Cook <keescook@...omium.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,
        x86@...nel.org
Subject: Re: [PATCH v4 06/29] tracing: move function tracer options to
 Kconfig

On Tue, 29 Sep 2020 14:46:08 -0700
Sami Tolvanen <samitolvanen@...gle.com> wrote:

> +++ b/kernel/trace/Kconfig
> @@ -595,6 +595,22 @@ config FTRACE_MCOUNT_RECORD
>  	depends on DYNAMIC_FTRACE
>  	depends on HAVE_FTRACE_MCOUNT_RECORD
>  
> +config FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY
> +	bool
> +	depends on FTRACE_MCOUNT_RECORD
> +
> +config FTRACE_MCOUNT_USE_CC
> +	def_bool y
> +	depends on $(cc-option,-mrecord-mcount)

Does the above get executed at every build? Or does a make *config need
to be done? If someone were to pass a .config to someone else that had
a compiler that didn't support this, would it be changed if the person
just did a make?

-- Steve


> +	depends on !FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY
> +	depends on FTRACE_MCOUNT_RECORD
> +
> +config FTRACE_MCOUNT_USE_RECORDMCOUNT
> +	def_bool y
> +	depends on !FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY
> +	depends on !FTRACE_MCOUNT_USE_CC
> +	depends on FTRACE_MCOUNT_RECORD
> +
>  config TRACING_MAP
>  	bool
>  	depends on ARCH_HAVE_NMI_SAFE_CMPXCHG