2 # SPDX-License-Identifier: GPL-2.0-only
4 # Script to update include/generated/autoksyms.h and dependency files
6 # Copyright: (C) 2016 Linaro Limited
7 # Created by: Nicolas Pitre, January 2016
10 # Update the include/generated/autoksyms.h file.
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.
19 cur_ksyms_file="include/generated/autoksyms.h"
20 new_ksyms_file="include/generated/autoksyms.h.tmpnew"
23 if [ "$quiet" != "silent_" ]; then
24 printf " %-7s %s\n" "$1" "$2"
28 info "CHK" "$cur_ksyms_file"
30 # Use "make V=1" to debug this script.
31 case "$KBUILD_VERBOSE" in
37 # Generate a new symbol list file
38 $CONFIG_SHELL $srctree/scripts/gen_autoksyms.sh "$new_ksyms_file"
40 # Extract changes between old and new list and touch corresponding
44 sort "$cur_ksyms_file" "$new_ksyms_file" | uniq -u |
45 sed -n 's/^#define __KSYM_\(.*\) 1/\1/p' |
46 while read sympath; do
47 if [ -z "$sympath" ]; then continue; fi
48 depfile="include/ksym/${sympath}"
49 mkdir -p "$(dirname "$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
62 if [ $changed -gt 0 ]; then
63 # Replace the old list with tne new one
64 old=$(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" "$cur_ksyms_file"
69 # Then trigger a rebuild of affected source files
72 rm -f "$new_ksyms_file"