LXR linux/scripts/adjust

   1#!/bin/sh
   2# SPDX-License-Identifier: GPL-2.0-only
   3
   4# Script to create/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# 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.
  12#
  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.
  17
  18set -e
  19
  20cur_ksyms_file="include/generated/autoksyms.h"
  21new_ksyms_file="include/generated/autoksyms.h.tmpnew"
  22
  23info() {
  24        if [ "$quiet" != "silent_" ]; then
  25                printf "  %-7s %s\n" "$1" "$2"
  26        fi
  27}
  28
  29info "CHK" "$cur_ksyms_file"
  30
  31# Use "make V=1" to debug this script.
  32case "$KBUILD_VERBOSE" in
  33*1*)
  34        set -x
  35        ;;
  36esac
  37
  38# We need access to CONFIG_ symbols
  39. include/config/auto.conf
  40
  41# Generate a new ksym list file with symbols needed by the current
  42# set of modules.
  43cat > "$new_ksyms_file" << EOT
  44/*
  45 * Automatically generated file; DO NOT EDIT.
  46 */
  47
  48EOT
  49sed 's/ko$/mod/' modules.order |
  50xargs -n1 sed -n -e '2{s/ /\n/g;/^$/!p;}' -- |
  51sort -u |
  52sed -e 's/\(.*\)/#define __KSYM_\1 1/' >> "$new_ksyms_file"
  53
  54# Special case for modversions (see modpost.c)
  55if [ -n "$CONFIG_MODVERSIONS" ]; then
  56        echo "#define __KSYM_module_layout 1" >> "$new_ksyms_file"
  57fi
  58
  59# Extract changes between old and new list and touch corresponding
  60# dependency files.
  61changed=$(
  62count=0
  63sort "$cur_ksyms_file" "$new_ksyms_file" | uniq -u |
  64sed -n 's/^#define __KSYM_\(.*\) 1/\1/p' | tr "A-Z_" "a-z/" |
  65while read sympath; do
  66        if [ -z "$sympath" ]; then continue; fi
  67        depfile="include/ksym/${sympath}.h"
  68        mkdir -p "$(dirname "$depfile")"
  69        touch "$depfile"
  70        # Filesystems with coarse time precision may create timestamps
  71        # equal to the one from a file that was very recently built and that
  72        # needs to be rebuild. Let's guard against that by making sure our
  73        # dep files are always newer than the first file we created here.
  74        while [ ! "$depfile" -nt "$new_ksyms_file" ]; do
  75                touch "$depfile"
  76        done
  77        echo $((count += 1))
  78done | tail -1 )
  79changed=${changed:-0}
  80
  81if [ $changed -gt 0 ]; then
  82        # Replace the old list with tne new one
  83        old=$(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
  89        exec $@
  90else
  91        rm -f "$new_ksyms_file"
  92fi
  93