Hi.
On Tue, Apr 14, 2020 at 10:21 AM Vitor Massaru Iha <vitor@xxxxxxxxxxx> wrote:
>
> In the following use case, when compiling the kernel for the UML
> architecture, for example:
>
> * `make ARCH=um defconfig && make ARCH=um -j8`,
>
> SUBARCH files are generated, however when we run the command:
>
> * `mrproper ARCH=um`
make ARCH=um mrproper
> the files `arch/$(SUBARCH)/include/generated/ aren't cleaned up.
>
> This generates compilation errors by running the following command:
>
> * `make ARCH=um defconfig O=./build_um && make ARCH=um -j8 O=./build_um`
>
> This PATCH fix that problem.
This patch fixes ...
>
> This makes it possible to compile on different architectures that use the
> SUBARCH variable, in different build directories and root directory of the
> linux directory. This is important because we can compile without the object
> files being overwritten. This reduces the re-compilation time in this use case.
Sorry, I do not understand this paragraph.
Brendan Higgins just reported the build error
in the out-of-tree build after in-tree build.
[1] make ARCH=um defconfig all
[2] make ARCH=um mrproper
[3] make ARCH=um O=foo defconfig all
-> build error
Ins't it?
>
> Besides that, in the workflow of developing unit tests, using kunit, and
> compiling in different architectures to develop or test a PATCH, this use case
> applies.
>
> * This bug was introduced in this commit a788b2ed81abe
Instead, adding Fixes tag is the convention.
Fixes: a788b2ed81ab ("kbuild: check arch/$(SRCARCH)/include/generated
before out-of-tree build")
>
> * Related bug: https://bugzilla.kernel.org/show_bug.cgi?id=205219
Maybe, this can be also a tag.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=205219
>
> Signed-off-by: Vitor Massaru Iha <vitor@xxxxxxxxxxx>
Reported-by: Brendan Higgins <brendanhiggins@xxxxxxxxxx>
> Reviewed-by: Brendan Higgins <brendanhiggins@xxxxxxxxxx>
> Tested-by: Brendan Higgins <brendanhiggins@xxxxxxxxxx>
> ---
> v2:
> * Explains what this PATCH does and the importance as suggested
> by Brendan Higgins.
> ---
> Makefile | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/Makefile b/Makefile
> index 70def4907036..e1a79796032e 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -532,7 +532,8 @@ outputmakefile:
> ifdef building_out_of_srctree
> $(Q)if [ -f $(srctree)/.config -o \
> -d $(srctree)/include/config -o \
> - -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
> + -d $(srctree)/arch/$(SRCARCH)/include/generated -o \
> + -d $(srctree)/arch/$(SUBARCH)/include/generated ]; then \
This hunk is unneeded.
> echo >&2 "***"; \
> echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
> echo >&2 "*** in $(abs_srctree)";\
> @@ -1388,6 +1389,7 @@ CLEAN_FILES += modules.builtin modules.builtin.modinfo modules.nsdeps
> # Directories & files removed with 'make mrproper'
> MRPROPER_DIRS += include/config include/generated \
> arch/$(SRCARCH)/include/generated .tmp_objdiff \
> + arch/$(SUBARCH)/include/generated \
> debian/ snap/ tar-install/
> MRPROPER_FILES += .config .config.old .version \
> Module.symvers \
> --
> 2.25.1
>
This problem is only related to ARCH=um builds.
So, it should be fixed in arch/um/Makefile.
diff --git a/arch/um/Makefile b/arch/um/Makefile
index d2daa206872d..275f5ffdf6f0 100644
--- a/arch/um/Makefile
+++ b/arch/um/Makefile
@@ -140,6 +140,7 @@ export CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS)
$(LD_FLAGS_CMDLINE)
# When cleaning we don't include .config, so we don't include
# TT or skas makefiles and don't clean skas_ptregs.h.
CLEAN_FILES += linux x.i gmon.out
+MRPROPER_DIRS += arch/$(SUBARCH)/include/generated
archclean:
@find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \
--
Best Regards
Masahiro Yamada
