2 # SPDX-License-Identifier: GPL-2.0-only
4 # Script to create/update include/generated/autoksyms.h and dependency files
6 # Copyright: (C) 2016 Linaro Limited
7 # Created by: Nicolas Pitre, January 2016
10 # Create/update the include/generated/autoksyms.h file from the list
11 # of all module's needed symbols as recorded on the second line of *.mod files.
13 # For each symbol being added or removed, the corresponding dependency
14 # file's timestamp is updated to force a rebuild of the affected source
15 # file. All arguments passed to this script are assumed to be a command
16 # to be exec'd to trigger a rebuild of those files.
20 cur_ksyms_file="include/generated/autoksyms.h"
21 new_ksyms_file="include/generated/autoksyms.h.tmpnew"
24 if [ "$quiet" != "silent_" ]; then
25 printf " %-7s %s\n" "$1" "$2"
29 info "CHK" "$cur_ksyms_file"
31 # Use "make V=1" to debug this script.
32 case "$KBUILD_VERBOSE" in
38 # We need access to CONFIG_ symbols
39 . include/config/auto.conf
41 # Generate a new ksym list file with symbols needed by the current
43 cat > "$new_ksyms_file" << EOT
45 * Automatically generated file; DO NOT EDIT.
49 sed 's/ko$/mod/' modules.order |
50 xargs -n1 sed -n -e '2{s/ /\n/g;/^$/!p;}' -- |
52 sed -e 's/\(.*\)/#define __KSYM_\1 1/' >> "$new_ksyms_file"
54 # Special case for modversions (see modpost.c)
55 if [ -n "$CONFIG_MODVERSIONS" ]; then
56 echo "#define __KSYM_module_layout 1" >> "$new_ksyms_file"
59 # Extract changes between old and new list and touch corresponding
63 sort "$cur_ksyms_file" "$new_ksyms_file" | uniq -u |
64 sed -n 's/^#define __KSYM_\(.*\) 1/\1/p' | tr "A-Z_" "a-z/" |
65 while read sympath; do
66 if [ -z "$sympath" ]; then continue; fi
67 depfile="include/ksym/${sympath}.h"
68 mkdir -p "$(dirname "$depfile")"
70 # Filesystems with coarse time precision may create timestamps
71 # equal to the one from a file that was very recently built and that
72 # needs to be rebuild. Let's guard against that by making sure our
73 # dep files are always newer than the first file we created here.
74 while [ ! "$depfile" -nt "$new_ksyms_file" ]; do
81 if [ $changed -gt 0 ]; then
82 # Replace the old list with tne new one
83 old=$(grep -c "^#define __KSYM_" "$cur_ksyms_file" || true)
84 new=$(grep -c "^#define __KSYM_" "$new_ksyms_file" || true)
85 info "KSYMS" "symbols: before=$old, after=$new, changed=$changed"
86 info "UPD" "$cur_ksyms_file"
87 mv -f "$new_ksyms_file" "$cur_ksyms_file"
88 # Then trigger a rebuild of affected source files
91 rm -f "$new_ksyms_file"