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authorMasahiro Yamada <yamada.masahiro@socionext.com>2019-10-08 21:05:56 +0900
committerMasahiro Yamada <yamada.masahiro@socionext.com>2019-11-11 20:10:01 +0900
commitf276031b4e2f4c961ed6d8a42f0f0124ccac2e09 (patch)
tree093c97a2c6a81682813e46473477596762f41a9e /kernel
parent1463f74f492eea7191f0178e01f3d38371a48210 (diff)
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kheaders: explain why include/config/autoconf.h is excluded from md5sum
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>
Diffstat (limited to 'kernel')
-rwxr-xr-xkernel/gen_kheaders.sh11
1 files changed, 9 insertions, 2 deletions
diff --git a/kernel/gen_kheaders.sh b/kernel/gen_kheaders.sh
index dc5744b93f8c..e13ca842eb7e 100755
--- 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" |