scripts/adjust_autoksyms.sh

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