* [PATCH 4.9/4.14/4.19] kbuild: Fix include path in scripts/Makefile.modpost
@ 2022-08-31 4:17 Nicolas Schier
2022-09-01 10:22 ` Greg KH
0 siblings, 1 reply; 2+ messages in thread
From: Nicolas Schier @ 2022-08-31 4:17 UTC (permalink / raw)
To: stable; +Cc: Jing Leng, Masahiro Yamada, Nicolas Schier
From: Jing Leng <jleng@ambarella.com>
commit 23a0cb8e3225122496bfa79172005c587c2d64bf upstream.
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 "$(OUT_DIR)" to
prevent compilation failure.
So the kernel should change the included path to avoid the copy operation.
Signed-off-by: Jing Leng <jleng@ambarella.com>
[masahiro: I do not think "M=$(OUT_DIR) src=$(PWD)" is the official way,
but this patch is a nice clean up anyway.]
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
[nsc: updated context for v4.19]
Signed-off-by: Nicolas Schier <n.schier@avm.de>
---
scripts/Makefile.modpost | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost
index 51884c7b8069..4eac2ecb35fb 100644
--- a/scripts/Makefile.modpost
+++ b/scripts/Makefile.modpost
@@ -51,8 +51,7 @@ 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)
endif
include scripts/Makefile.lib
--
2.37.2
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH 4.9/4.14/4.19] kbuild: Fix include path in scripts/Makefile.modpost
2022-08-31 4:17 [PATCH 4.9/4.14/4.19] kbuild: Fix include path in scripts/Makefile.modpost Nicolas Schier
@ 2022-09-01 10:22 ` Greg KH
0 siblings, 0 replies; 2+ messages in thread
From: Greg KH @ 2022-09-01 10:22 UTC (permalink / raw)
To: Nicolas Schier; +Cc: stable, Jing Leng, Masahiro Yamada
On Wed, Aug 31, 2022 at 06:17:26AM +0200, Nicolas Schier wrote:
> From: Jing Leng <jleng@ambarella.com>
>
> commit 23a0cb8e3225122496bfa79172005c587c2d64bf upstream.
>
> 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 "$(OUT_DIR)" to
> prevent compilation failure.
>
> So the kernel should change the included path to avoid the copy operation.
>
> Signed-off-by: Jing Leng <jleng@ambarella.com>
> [masahiro: I do not think "M=$(OUT_DIR) src=$(PWD)" is the official way,
> but this patch is a nice clean up anyway.]
> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
> [nsc: updated context for v4.19]
> Signed-off-by: Nicolas Schier <n.schier@avm.de>
> ---
> scripts/Makefile.modpost | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
This worked for 5.4.y as well, so I took it there too.
thanks,
greg k-h
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