Masahiro Yamada b10fdeea8c kbuild: check sha1sum just once for each atomic header
It is unneeded to check the sha1sum every time.

Create the timestamp files to manage it.

Add '.' to clean-dirs because 'make clean' must visit ./Kbuild to
clean up the timestamp files.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2022-09-29 04:40:14 +09:00
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