LXR linux/scripts/adjust

   1#!/bin/sh
   2
   3# Script to create/update include/generated/autoksyms.h and dependency files
   4#
   5# Copyright:    (C) 2016  Linaro Limited
   6# Created by:   Nicolas Pitre, January 2016
   7#
   8# This program is free software; you can redistribute it and/or modify
   9# it under the terms of the GNU General Public License version 2 as
  10# published by the Free Software Foundation.
  11
  12# Create/update the include/generated/autoksyms.h file from the list
  13# of all module's needed symbols as recorded on the third line of
  14# .tmp_versions/*.mod files.
  15#
  16# For each symbol being added or removed, the corresponding dependency
  17# file's timestamp is updated to force a rebuild of the affected source
  18# file. All arguments passed to this script are assumed to be a command
  19# to be exec'd to trigger a rebuild of those files.
  20
  21set -e
  22
  23cur_ksyms_file="include/generated/autoksyms.h"
  24new_ksyms_file="include/generated/autoksyms.h.tmpnew"
  25
  26info() {
  27        if [ "$quiet" != "silent_" ]; then
  28                printf "  %-7s %s\n" "$1" "$2"
  29        fi
  30}
  31
  32info "CHK" "$cur_ksyms_file"
  33
  34# Use "make V=1" to debug this script.
  35case "$KBUILD_VERBOSE" in
  36*1*)
  37        set -x
  38        ;;
  39esac
  40
  41# We need access to CONFIG_ symbols
  42case "${KCONFIG_CONFIG}" in
  43*/*)
  44        . "${KCONFIG_CONFIG}"
  45        ;;
  46*)
  47        # Force using a file from the current directory
  48        . "./${KCONFIG_CONFIG}"
  49esac
  50
  51# Generate a new ksym list file with symbols needed by the current
  52# set of modules.
  53cat > "$new_ksyms_file" << EOT
  54/*
  55 * Automatically generated file; DO NOT EDIT.
  56 */
  57
  58EOT
  59[ "$(ls -A "$MODVERDIR")" ] &&
  60for mod in "$MODVERDIR"/*.mod; do
  61        sed -n -e '3{s/ /\n/g;/^$/!p;}' "$mod"
  62done | sort -u |
  63while read sym; do
  64        if [ -n "$CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX" ]; then
  65                sym="${sym#_}"
  66        fi
  67        echo "#define __KSYM_${sym} 1"
  68done >> "$new_ksyms_file"
  69
  70# Special case for modversions (see modpost.c)
  71if [ -n "$CONFIG_MODVERSIONS" ]; then
  72        echo "#define __KSYM_module_layout 1" >> "$new_ksyms_file"
  73fi
  74
  75# Extract changes between old and new list and touch corresponding
  76# dependency files.
  77changed=$(
  78count=0
  79sort "$cur_ksyms_file" "$new_ksyms_file" | uniq -u |
  80sed -n 's/^#define __KSYM_\(.*\) 1/\1/p' | tr "A-Z_" "a-z/" |
  81while read sympath; do
  82        if [ -z "$sympath" ]; then continue; fi
  83        depfile="include/ksym/${sympath}.h"
  84        mkdir -p "$(dirname "$depfile")"
  85        touch "$depfile"
  86        # Filesystems with coarse time precision may create timestamps
  87        # equal to the one from a file that was very recently built and that
  88        # needs to be rebuild. Let's guard against that by making sure our
  89        # dep files are always newer than the first file we created here.
  90        while [ ! "$depfile" -nt "$new_ksyms_file" ]; do
  91                touch "$depfile"
  92        done
  93        echo $((count += 1))
  94done | tail -1 )
  95changed=${changed:-0}
  96
  97if [ $changed -gt 0 ]; then
  98        # Replace the old list with tne new one
  99        old=$(grep -c "^#define __KSYM_" "$cur_ksyms_file" || true)
 100        new=$(grep -c "^#define __KSYM_" "$new_ksyms_file" || true)
 101        info "KSYMS" "symbols: before=$old, after=$new, changed=$changed"
 102        info "UPD" "$cur_ksyms_file"
 103        mv -f "$new_ksyms_file" "$cur_ksyms_file"
 104        # Then trigger a rebuild of affected source files
 105        exec $@
 106else
 107        rm -f "$new_ksyms_file"
 108fi
 109