1#!/bin/sh 2# SPDX-License-Identifier: GPL-2.0-only 3 4# Script to update include/generated/autoksyms.h and dependency files 5# 6# Copyright: (C) 2016 Linaro Limited 7# Created by: Nicolas Pitre, January 2016 8# 9 10# Update the include/generated/autoksyms.h file. 11# 12# For each symbol being added or removed, the corresponding dependency 13# file's timestamp is updated to force a rebuild of the affected source 14# file. All arguments passed to this script are assumed to be a command 15# to be exec'd to trigger a rebuild of those files. 16 17set -e 18 19cur_ksyms_file="include/generated/autoksyms.h" 20new_ksyms_file="include/generated/autoksyms.h.tmpnew" 21 22info() { 23 if [ "$quiet" != "silent_" ]; then 24 printf " %-7s %s\n" "$1" "$2" 25 fi 26} 27 28info "CHK" "$cur_ksyms_file" 29 30# Use "make V=1" to debug this script. 31case "$KBUILD_VERBOSE" in 32*1*) 33 set -x 34 ;; 35esac 36 37# Generate a new symbol list file 38$CONFIG_SHELL $srctree/scripts/gen_autoksyms.sh "$new_ksyms_file" 39 40# Extract changes between old and new list and touch corresponding 41# dependency files. 42changed=$( 43count=0 44sort "$cur_ksyms_file" "$new_ksyms_file" | uniq -u | 45sed -n 's/^#define __KSYM_\(.*\) 1/\1/p' | tr "A-Z_" "a-z/" | 46while read sympath; do 47 if [ -z "$sympath" ]; then continue; fi 48 depfile="include/ksym/${sympath}.h" 49 mkdir -p "$(dirname "$depfile")" 50 touch "$depfile" 51 # Filesystems with coarse time precision may create timestamps 52 # equal to the one from a file that was very recently built and that 53 # needs to be rebuild. Let's guard against that by making sure our 54 # dep files are always newer than the first file we created here. 55 while [ ! "$depfile" -nt "$new_ksyms_file" ]; do 56 touch "$depfile" 57 done 58 echo $((count += 1)) 59done | tail -1 ) 60changed=${changed:-0} 61 62if [ $changed -gt 0 ]; then 63 # Replace the old list with tne new one 64 old=$(grep -c "^#define __KSYM_" "$cur_ksyms_file" || true) 65 new=$(grep -c "^#define __KSYM_" "$new_ksyms_file" || true) 66 info "KSYMS" "symbols: before=$old, after=$new, changed=$changed" 67 info "UPD" "$cur_ksyms_file" 68 mv -f "$new_ksyms_file" "$cur_ksyms_file" 69 # Then trigger a rebuild of affected source files 70 exec $@ 71else 72 rm -f "$new_ksyms_file" 73fi 74