scripts/adjust_autoksyms.sh

   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
  21 set -e
  22
  23 cur_ksyms_file="include/generated/autoksyms.h"
  24 new_ksyms_file="include/generated/autoksyms.h.tmpnew"
  25
  26 info() {
  27         if [ "$quiet" != "silent_" ]; then
  28                 printf "  %-7s %s\n" "$1" "$2"
  29         fi
  30 }
  31
  32 info "CHK" "$cur_ksyms_file"
  33
  34 # Use "make V=1" to debug this script.
  35 case "$KBUILD_VERBOSE" in
  36 *1*)
  37         set -x
  38         ;;
  39 esac
  40
  41 # We need access to CONFIG_ symbols
  42 . include/config/auto.conf
  43
  44 # Generate a new ksym list file with symbols needed by the current
  45 # set of modules.
  46 cat > "$new_ksyms_file" << EOT
  47 /*
  48  * Automatically generated file; DO NOT EDIT.
  49  */
  50
  51 EOT
  52 [ "$(ls -A "$MODVERDIR")" ] &&
  53 for mod in "$MODVERDIR"/*.mod; do
  54         sed -n -e '3{s/ /\n/g;/^$/!p;}' "$mod"
  55 done | sort -u |
  56 while read sym; do
  57         echo "#define __KSYM_${sym} 1"
  58 done >> "$new_ksyms_file"
  59
  60 # Special case for modversions (see modpost.c)
  61 if [ -n "$CONFIG_MODVERSIONS" ]; then
  62         echo "#define __KSYM_module_layout 1" >> "$new_ksyms_file"
  63 fi
  64
  65 # Extract changes between old and new list and touch corresponding
  66 # dependency files.
  67 changed=$(
  68 count=0
  69 sort "$cur_ksyms_file" "$new_ksyms_file" | uniq -u |
  70 sed -n 's/^#define __KSYM_\(.*\) 1/\1/p' | tr "A-Z_" "a-z/" |
  71 while read sympath; do
  72         if [ -z "$sympath" ]; then continue; fi
  73         depfile="include/ksym/${sympath}.h"
  74         mkdir -p "$(dirname "$depfile")"
  75         touch "$depfile"
  76         # Filesystems with coarse time precision may create timestamps
  77         # equal to the one from a file that was very recently built and that
  78         # needs to be rebuild. Let's guard against that by making sure our
  79         # dep files are always newer than the first file we created here.
  80         while [ ! "$depfile" -nt "$new_ksyms_file" ]; do
  81                 touch "$depfile"
  82         done
  83         echo $((count += 1))
  84 done | tail -1 )
  85 changed=${changed:-0}
  86
  87 if [ $changed -gt 0 ]; then
  88         # Replace the old list with tne new one
  89         old=$(grep -c "^#define __KSYM_" "$cur_ksyms_file" || true)
  90         new=$(grep -c "^#define __KSYM_" "$new_ksyms_file" || true)
  91         info "KSYMS" "symbols: before=$old, after=$new, changed=$changed"
  92         info "UPD" "$cur_ksyms_file"
  93         mv -f "$new_ksyms_file" "$cur_ksyms_file"
  94         # Then trigger a rebuild of affected source files
  95         exec $@
  96 else
  97         rm -f "$new_ksyms_file"
  98 fi