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#!/bin/sh # SPDX-License-Identifier: GPL-2.0-only # Script to create/update include/generated/autoksyms.h and dependency files # # Copyright: (C) 2016 Linaro Limited # Created by: Nicolas Pitre, January 2016 # # Create/update the include/generated/autoksyms.h file from the list # of all module's needed symbols as recorded on the second line of *.mod files. # # For each symbol being added or removed, the corresponding dependency # file's timestamp is updated to force a rebuild of the affected source # file. All arguments passed to this script are assumed to be a command # to be exec'd to trigger a rebuild of those files. set -e cur_ksyms_file="include/generated/autoksyms.h" new_ksyms_file="include/generated/autoksyms.h.tmpnew" info() { if [ "$quiet" != "silent_" ]; then printf " %-7s %s\n" "$1" "$2" fi } info "CHK" "$cur_ksyms_file" # Use "make V=1" to debug this script. case "$KBUILD_VERBOSE" in *1*) set -x ;; esac # We need access to CONFIG_ symbols . include/config/auto.conf # Generate a new ksym list file with symbols needed by the current # set of modules. cat > "$new_ksyms_file" << EOT /* * Automatically generated file; DO NOT EDIT. */ EOT sed 's/ko$/mod/' modules.order | xargs -n1 sed -n -e '2{s/ /\n/g;/^$/!p;}' -- | sort -u | sed -e 's/\(.*\)/#define __KSYM_\1 1/' >> "$new_ksyms_file" # Special case for modversions (see modpost.c) if [ -n "$CONFIG_MODVERSIONS" ]; then echo "#define __KSYM_module_layout 1" >> "$new_ksyms_file" fi # Extract changes between old and new list and touch corresponding # dependency files. changed=$( count=0 sort "$cur_ksyms_file" "$new_ksyms_file" | uniq -u | sed -n 's/^#define __KSYM_\(.*\) 1/\1/p' | tr "A-Z_" "a-z/" | while read sympath; do if [ -z "$sympath" ]; then continue; fi depfile="include/ksym/${sympath}.h" mkdir -p "$(dirname "$depfile")" touch "$depfile" # Filesystems with coarse time precision may create timestamps # equal to the one from a file that was very recently built and that # needs to be rebuild. Let's guard against that by making sure our # dep files are always newer than the first file we created here. while [ ! "$depfile" -nt "$new_ksyms_file" ]; do touch "$depfile" done echo $((count += 1)) done | tail -1 ) changed=${changed:-0} if [ $changed -gt 0 ]; then # Replace the old list with tne new one old=$(grep -c "^#define __KSYM_" "$cur_ksyms_file" || true) new=$(grep -c "^#define __KSYM_" "$new_ksyms_file" || true) info "KSYMS" "symbols: before=$old, after=$new, changed=$changed" info "UPD" "$cur_ksyms_file" mv -f "$new_ksyms_file" "$cur_ksyms_file" # Then trigger a rebuild of affected source files exec $@ else rm -f "$new_ksyms_file" fi
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