kheaders: optimize header copy for in-tree builds (ea79e516) · Commits · 戴 / test

This script copies headers by the cpio command twice; first from srctree, and then from objtree. However, when we building in-tree, we know the srctree and the objtree are the same. That is, all the headers copied by the first cpio are overwritten by the second one. Skip the first cpio when we are building in-tree. Signed-off-by:

Masahiro Yamada <yamada.masahiro@socionext.com>

kernel/gen_kheaders.sh

+9 −7

Original line number	Diff line number	Diff line
		@@ -56,14 +56,16 @@ fi
		rm -rf $cpio_dir
		mkdir $cpio_dir

		if [ "$building_out_of_srctree" ]; then
		pushd $srctree > /dev/null
		for f in $dir_list;
		for f in $dir_list
		do find "$f" -name "*.h";
		done \| cpio --quiet -pd $cpio_dir
		popd > /dev/null
		fi

		# The second CPIO can complain if files already exist which can
		# happen with out of tree builds. Just silence CPIO for now.
		# The second CPIO can complain if files already exist which can happen with out
		# of tree builds having stale headers in srctree. Just silence CPIO for now.
		for f in $dir_list;
		do find "$f" -name "*.h";
		done \| cpio --quiet -pd $cpio_dir >/dev/null 2>&1

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