linux-kernel - Re: [PATCH] Add MO(mod objs) variable to process ext modules with subdirs

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Message-ID: <b102d460-adbe-4396-ac1b-ad2f2244061c@infradead.org>
Date: Tue, 2 Apr 2024 19:10:05 -0700
From: Randy Dunlap <rdunlap@...radead.org>
To: Valerii Chernous <vchernou@...co.com>,
 Masahiro Yamada <masahiroy@...nel.org>, Nathan Chancellor
 <nathan@...nel.org>, Nicolas Schier <nicolas@...sle.eu>
Cc: xe-linux-external@...co.com, linux-kbuild@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Add MO(mod objs) variable to process ext modules with
 subdirs

Hi,

On 4/2/24 8:30 AM, Valerii Chernous wrote:
> The change allow to build external modules with nested makefiles.
> With current unofficial way(using "src" variable) it is posible to build

                                                          possible

> external(out of tree) kernel module with separating source and build
> artifacts dirs but with nested makefiles it doesn't work properly.
> Build system trap to recursion inside makefiles, articafts output dir

                                                   artifacts

> path grow with each iteration until exceed max path len and build failed
> Providing "MO" variable and using "override" directive with declaring
> "src" variable solve the problem
> Usage example:
> make -C KERNEL_SOURCE_TREE MO=BUILD_OUT_DIR M=EXT_MOD_SRC_DIR modules
> 
> Cc: xe-linux-external@...co.com
> Cc: Valerii Chernous <vchernou@...co.com>
> Signed-off-by: Valerii Chernous <vchernou@...co.com>
> ---
>  Makefile               | 17 +++++++++++++++++
>  scripts/Makefile.build |  7 +++++++
>  2 files changed, 24 insertions(+)
> 

If this code is going to be merged, there should also be a Documentation
update to Documentation/kbuild/{kbuild.rst,modules.rst}.

Thanks.
-- 
#Randy