linux-kernel - Re: [PATCH 2/6] module: add CONFIG_BUILTIN

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Message-Id: <20231209075917.833c8f1ae78172dbb1d83b97@kernel.org>
Date:   Sat, 9 Dec 2023 07:59:17 +0900
From:   Masami Hiramatsu (Google) <mhiramat@...nel.org>
To:     Kris Van Hees <kris.van.hees@...cle.com>
Cc:     linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
        linux-modules@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
        Nick Alcock <nick.alcock@...cle.com>,
        Alan Maguire <alan.maguire@...cle.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Jiri Olsa <olsajiri@...il.com>
Subject: Re: [PATCH 2/6] module: add CONFIG_BUILTIN_RANGES option

On Fri,  8 Dec 2023 00:07:48 -0500
Kris Van Hees <kris.van.hees@...cle.com> wrote:

> The CONFIG_BUILTIN_RANGES option controls whether offset range data is
> generated for kernel modules that are built into the kernel image.
> 
> Signed-off-by: Kris Van Hees <kris.van.hees@...cle.com>
> Reviewed-by: Nick Alcock <nick.alcock@...cle.com>
> Reviewed-by: Alan Maguire <alan.maguire@...cle.com>
> ---
>  kernel/module/Kconfig | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 
> diff --git a/kernel/module/Kconfig b/kernel/module/Kconfig
> index 33a2e991f608..0798439b11ac 100644
> --- a/kernel/module/Kconfig
> +++ b/kernel/module/Kconfig
> @@ -389,4 +389,21 @@ config MODULES_TREE_LOOKUP
>  	def_bool y
>  	depends on PERF_EVENTS || TRACING || CFI_CLANG
>  
> +config BUILTIN_RANGES

BUILTIN_MODULE_RANGES ?
BTW, even if CONFIG_MODULES=n, we can embed the kernel module code.
So should this visible if the CONFIG_MODULES=n ?

Thank you,

> +	bool "Generate address range information for builtin modules"
> +	depends on VMLINUX_MAP
> +	help
> +	  When modules are built into the kernel, there will be no module name
> +	  associated with its symbols in /proc/kallsyms.  Tracers may want to
> +	  identify symbols by module name and symbol name regardless of whether
> +	  the module is configured as loadable or not.
> +
> +	  This option generates modules.builtin.ranges in the build tree with
> +	  offset ranges (per ELF section) for the module(s) they belong to.
> +	  It also records an anchor symbol to determine the load address of the
> +	  section.
> +
> +	  It is fully compatible with CONFIG_RANDOMIZE_BASE and similar late-
> +	  address-modification options.
> +
>  endif # MODULES
> -- 
> 2.42.0
> 


-- 
Masami Hiramatsu (Google) <mhiramat@...nel.org>