Hi, I was pointed to this thread since I'm trying something similar
in kmod's testsuite. See below.
On Tue, May 24, 2022 at 02:52:45AM GMT, Masahiro Yamada wrote:
On Tue, May 17, 2022 at 7:51 PM <3090101217@xxxxxxxxxx> wrote:
From: Jing Leng <jleng@xxxxxxxxxxxxx>
When building an external module, if users don't need to separate the
compilation output and source code, they run the following command:
"make -C $(LINUX_SRC_DIR) M=$(PWD)". At this point, "$(KBUILD_EXTMOD)"
and "$(src)" are the same.
If they need to separate them, they run "make -C $(KERNEL_SRC_DIR)
O=$(KERNEL_OUT_DIR) M=$(OUT_DIR) src=$(PWD)". Before running the
command, they need to copy "Kbuild" or "Makefile" to "$(OUT_DIR)" to
prevent compilation failure.
So the kernel should change the included path to avoid the copy operation.
Signed-off-by: Jing Leng <jleng@xxxxxxxxxxxxx>
---
scripts/Makefile.modpost | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost
index 48585c4d04ad..0273bf7375e2 100644
--- a/scripts/Makefile.modpost
+++ b/scripts/Makefile.modpost
@@ -87,8 +87,7 @@ obj := $(KBUILD_EXTMOD)
src := $(obj)
# Include the module's Makefile to find KBUILD_EXTRA_SYMBOLS
-include $(if $(wildcard $(KBUILD_EXTMOD)/Kbuild), \
- $(KBUILD_EXTMOD)/Kbuild, $(KBUILD_EXTMOD)/Makefile)
+include $(if $(wildcard $(src)/Kbuild), $(src)/Kbuild, $(src)/Makefile)
# modpost option for external modules
MODPOST += -e
--
2.17.1
I do not think "M=$(OUT_DIR) src=$(PWD)" is the official way,
but this patch is a clean up.
I tried what is in this patch and also tried to find an official way in
the docs.
In kmod's testsuite we build dummy kernel modules to exercise the API.
https://git.kernel.org/pub/scm/utils/kernel/kmod/kmod.git/tree/testsuite/module-playground
This works:
make -C /lib/modules/$(uname -r)/build M=$PWD
This doesn't:
make -C /lib/modules/$(uname -r)/build M=$PWD O=/tmp/kmod_test_modules
I also tried the variants above with setting src, but all of them give
me errors - I used 6.10 and 6.11-rc7 for these tests.
Is there a way to do this?
thanks
Lucas De Marchi
Applied to linux-kbuild. Thanks.
--
Best Regards
Masahiro Yamada
