#!/bin/sh# SPDX-License-Identifier: GPL-2.0 # This script generates an archive consisting of kernel headers# for CONFIG_IKHEADERS.set -esfile="$(readlink -f "$0")"outdir="$(pwd)"tarfile=$1cpio_dir=$outdir/${tarfile%/*}/.tmp_cpio_dir dir_list="include/arch/$SRCARCH/include/" type cpio > /dev/null # Support incremental builds by skipping archive generation# if timestamps of files being archived are not changed. # This block is useful for debugging the incremental builds.# Uncomment it for debugging.# if [ ! -f /tmp/iter ]; then iter=1; echo 1 > /tmp/iter;# else iter=$(($(cat /tmp/iter) + 1)); echo $iter > /tmp/iter; fi# find $all_dirs -name "*.h" | xargs ls -l > /tmp/ls-$iter all_dirs=if [ "$building_out_of_srctree" ]; then	for d in $dir_list; do		all_dirs="$all_dirs $srctree/$d"	donefiall_dirs="$all_dirs $dir_list" # include/generated/utsversion.h is ignored because it is generated after this# script is executed. (utsversion.h is unneeded for kheaders)## When Kconfig regenerates include/generated/autoconf.h, its timestamp is# updated, but the contents might be still the same. When any CONFIG option is# changed, Kconfig touches the corresponding timestamp file include/config/*.# Hence, the md5sum detects the configuration change anyway. We do not need to# check include/generated/autoconf.h explicitly.## Ignore them for md5 calculation to avoid pointless regeneration.headers_md5="$(find $all_dirs -name "*.h"			|		grep -v "include/generated/utsversion.h"	|		grep -v "include/generated/autoconf.h"	|		xargs ls -l | md5sum | cut -d ' ' -f1)" # Any changes to this script will also cause a rebuild of the archive.this_file_md5="$(ls -l $sfile | md5sum | cut -d ' ' -f1)"if [ -f $tarfile ]; then tarfile_md5="$(md5sum $tarfile | cut -d ' ' -f1)"; fiif [ -f kernel/kheaders.md5 ] &&	[ "$(head -n 1 kernel/kheaders.md5)" = "$headers_md5" ] &&	[ "$(head -n 2 kernel/kheaders.md5 | tail -n 1)" = "$this_file_md5" ] &&	[ "$(tail -n 1 kernel/kheaders.md5)" = "$tarfile_md5" ]; then		exitfi echo "  GEN     $tarfile" rm -rf $cpio_dirmkdir $cpio_dir if [ "$building_out_of_srctree" ]; then	(		cd $srctree		for f in $dir_list			do find "$f" -name "*.h";		done | cpio --quiet -pd $cpio_dir	)fi # 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 -pdu $cpio_dir >/dev/null 2>&1 # Remove comments except SDPX linesfind $cpio_dir -type f -print0 |	xargs -0 -P8 -n1 perl -pi -e 'BEGIN {undef $/;}; s/\/\*((?!SPDX).)*?\*\///smg;' # Create archive and try to normalize metadata for reproducibility.tar "${KBUILD_BUILD_TIMESTAMP:+--mtime=$KBUILD_BUILD_TIMESTAMP}" \    --owner=0 --group=0 --sort=name --numeric-owner \    -I $XZ -cf $tarfile -C $cpio_dir/ . > /dev/null echo $headers_md5 > kernel/kheaders.md5echo "$this_file_md5" >> kernel/kheaders.md5echo "$(md5sum $tarfile | cut -d ' ' -f1)" >> kernel/kheaders.md5 rm -rf $cpio_dir