[5/5] kheaders: explain why include/config/autoconf.h is excluded from md5sum
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Message ID 20191008120556.4263-5-yamada.masahiro@socionext.com
State New
Headers show
Series
  • [1/5] kheaders: remove unneeded 'cat' command piped to 'head' / 'tail'
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Commit Message

Masahiro Yamada Oct. 8, 2019, 12:05 p.m. UTC
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>
---

 kernel/gen_kheaders.sh | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

Patch
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diff --git a/kernel/gen_kheaders.sh b/kernel/gen_kheaders.sh
index 6c5f88f3ca2d..b229a84693e5 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"	|