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kheaders: explain why include/config/autoconf.h is excluded from md5sum

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This comment block explains why include/generated/compile.h is omitted,
but nothing about include/generated/autoconf.h, which might be more
difficult to understand. Add more comments.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
This commit is contained in:
Masahiro Yamada 2019-10-08 21:05:56 +09:00
parent 1463f74f49
commit f276031b4e
1 changed files with 9 additions and 2 deletions
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11
kernel/gen_kheaders.sh
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@ -32,8 +32,15 @@ fi
all_dirs="$all_dirs $dir_list"
# include/generated/compile.h is ignored because it is touched even when none
# of the source files changed. This causes pointless regeneration, so let us
# ignore them for md5 calculation.
# of the source files changed.
#
# When Kconfig regenerates include/generated/autoconf.h, its timestamp is
# updated, but the contents might be still the same. When any CONFIG option is
# changed, Kconfig touches the corresponding timestamp file include/config/*.h.
# Hence, the md5sum detects the configuration change anyway. We do not need to
# check include/generated/autoconf.h explicitly.
#
# Ignore them for md5 calculation to avoid pointless regeneration.
headers_md5="$(find $all_dirs -name "*.h" |
grep -v "include/generated/compile.h" |
grep -v "include/generated/autoconf.h" |