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Subject[PATCH] kbuild: clean compressed initramfs image
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Since commit 9e3596b0c653 ("kbuild: initramfs cleanup, set target from
Kconfig") "make clean" leaves behind compressed initramfs images.
Example:
$ make defconfig
$ sed -i 's|CONFIG_INITRAMFS_SOURCE=""|CONFIG_INITRAMFS_SOURCE="/tmp/ir.cpio"|' .config
$ make olddefconfig
$ make -s
$ make -s clean
$ git clean -ndxf | grep initramfs
Would remove usr/initramfs_data.cpio.gz

clean rules do not have CONFIG_* context so they do not know which
compression format was used. Thus they don't know which files to
delete.

Tell clean to delete all possible compression formats.

Once patched usr/initramfs_data.cpio.gz and friends are deleted by
"make clean".

Fixes: 9e3596b0c653 ("kbuild: initramfs cleanup, set target from Kconfig")
Signed-off-by: Greg Thelen <gthelen@google.com>
---
usr/Makefile | 3 +++
1 file changed, 3 insertions(+)

diff --git a/usr/Makefile b/usr/Makefile
index 6a89eb019275..e6f7cb2f81db 100644
--- a/usr/Makefile
+++ b/usr/Makefile
@@ -11,6 +11,9 @@ datafile_y = initramfs_data.cpio$(suffix_y)
datafile_d_y = .$(datafile_y).d
AFLAGS_initramfs_data.o += -DINITRAMFS_IMAGE="usr/$(datafile_y)"

+# clean rules do not have CONFIG_INITRAMFS_COMPRESSION. So clean up after all
+# possible compression formats.
+clean-files += initramfs_data.cpio*

# Generate builtin.o based on initramfs_data.o
obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o
--
2.22.0.657.g960e92d24f-goog
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