linux-kernel - [PATCH] kbuild: Fix include path in scripts/Makefile.modpost

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Message-Id: <20220517105128.9720-1-3090101217@zju.edu.cn>
Date:   Tue, 17 May 2022 18:51:28 +0800
From:   3090101217@....edu.cn
To:     masahiroy@...nel.org, michal.lkml@...kovi.net,
        ndesaulniers@...gle.com
Cc:     linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jing Leng <jleng@...arella.com>
Subject: [PATCH] kbuild: Fix include path in scripts/Makefile.modpost

From: Jing Leng <jleng@...arella.com>

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@...arella.com>
---
 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