From: Masahiro Yamada yamada.masahiro@socionext.com
commit f276031b4e2f4c961ed6d8a42f0f0124ccac2e09 upstream.
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 Signed-off-by: Matthias Maennich maennich@google.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- kernel/gen_kheaders.sh | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-)
--- a/kernel/gen_kheaders.sh +++ b/kernel/gen_kheaders.sh @@ -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" |