From: Masahiro Yamada <masahi...@kernel.org> [ Upstream commit ab09da75700e9d25c7dfbc7f7934920beb5e39b9 ]
Building the kernel with O= is affected by stale in-tree build artifacts. So, if the source tree is not clean, Kbuild displays the following: $ make ARCH=um O=build defconfig make[1]: Entering directory '/.../linux/build' *** *** The source tree is not clean, please run 'make ARCH=um mrproper' *** in /.../linux *** make[2]: *** [/.../linux/Makefile:673: outputmakefile] Error 1 make[1]: *** [/.../linux/Makefile:248: __sub-make] Error 2 make[1]: Leaving directory '/.../linux/build' make: *** [Makefile:248: __sub-make] Error 2 Usually, running 'make mrproper' is sufficient for cleaning the source tree for out-of-tree builds. However, building UML generates build artifacts not only in arch/um/, but also in the SUBARCH directory (i.e., arch/x86/). If in-tree stale files remain under arch/x86/, Kbuild will reuse them instead of creating new ones under the specified build directory. This commit makes 'make ARCH=um clean' recurse into the SUBARCH directory. Reported-by: Shuah Khan <sk...@linuxfoundation.org> Closes: https://lore.kernel.org/lkml/20250502172459.14175-1-sk...@linuxfoundation.org/ Signed-off-by: Masahiro Yamada <masahi...@kernel.org> Acked-by: Johannes Berg <johan...@sipsolutions.net> Reviewed-by: David Gow <david...@google.com> Reviewed-by: Shuah Khan <sk...@linuxfoundation.org> Signed-off-by: Sasha Levin <sas...@kernel.org> --- arch/um/Makefile | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/um/Makefile b/arch/um/Makefile index 4211e23a2f68f..e2caca06c1553 100644 --- a/arch/um/Makefile +++ b/arch/um/Makefile @@ -153,5 +153,6 @@ MRPROPER_FILES += $(HOST_DIR)/include/generated archclean: @find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \ -o -name '*.gcov' \) -type f -print | xargs rm -f + $(Q)$(MAKE) -f $(srctree)/Makefile ARCH=$(HEADER_ARCH) clean export HEADER_ARCH SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING OS DEV_NULL_PATH -- 2.39.5
