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 "$KBUILD_VERBOSE" in 32*1*) 33 set -x 34 ;; 35esac 36 37# We need access to CONFIG_ symbols 38. include/config/auto.conf 39 40# Generate a new symbol list file 41$CONFIG_SHELL $srctree/scripts/gen_autoksyms.sh "$new_ksyms_file" 42 43# Extract changes between old and new list and touch corresponding 44# dependency files. 45changed=$( 46count=0 47sort "$cur_ksyms_file" "$new_ksyms_file" | uniq -u | 48sed -n 's/^#define __KSYM_\(.*\) 1/\1/p' | tr "A-Z_" "a-z/" | 49while read sympath; do 50 if [ -z "$sympath" ]; then continue; fi 51 depfile="include/ksym/${sympath}.h" 52 mkdir -p "$(dirname "$depfile")" 53 touch "$depfile" 54 # Filesystems with coarse time precision may create timestamps 55 # equal to the one from a file that was very recently built and that 56 # needs to be rebuild. Let's guard against that by making sure our 57 # dep files are always newer than the first file we created here. 58 while [ ! "$depfile" -nt "$new_ksyms_file" ]; do 59 touch "$depfile" 60 done 61 echo $((count += 1)) 62done | tail -1 ) 63changed=${changed:-0} 64 65if [ $changed -gt 0 ]; then 66 # Replace the old list with tne new one 67 old=$(grep -c "^#define __KSYM_" "$cur_ksyms_file" || true) 68 new=$(grep -c "^#define __KSYM_" "$new_ksyms_file" || true) 69 info "KSYMS" "symbols: before=$old, after=$new, changed=$changed" 70 info "UPD" "$cur_ksyms_file" 71 mv -f "$new_ksyms_file" "$cur_ksyms_file" 72 # Then trigger a rebuild of affected source files 73 exec $@ 74else 75 rm -f "$new_ksyms_file" 76fi 77