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

[Steven Rostedt]

On Tue, 29 Sep 2020 14:46:08 -0700
Sami Tolvanen <samitolvanen@xxxxxxxxxx> 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