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 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
  18 set -e
  19
  20 cur_ksyms_file="include/generated/autoksyms.h"
  21 new_ksyms_file="include/generated/autoksyms.h.tmpnew"
  22
  23 info() {
  24         if [ "$quiet" != "silent_" ]; then
  25                 printf "  %-7s %s\n" "$1" "$2"
  26         fi
  27 }
  28
  29 info "CHK" "$cur_ksyms_file"
  30
  31 # Use "make V=1" to debug this script.
  32 case "$KBUILD_VERBOSE" in
  33 *1*)
  34         set -x
  35         ;;
  36 esac
  37
  38 # We need access to CONFIG_ symbols
  39 . include/config/auto.conf
  40
  41 # Generate a new ksym list file with symbols needed by the current
  42 # set of modules.
  43 cat > "$new_ksyms_file" << EOT
  44 /*
  45  * Automatically generated file; DO NOT EDIT.
  46  */
  47
  48 EOT
  49 sed 's/ko$/mod/' modules.order |
  50 xargs -n1 sed -n -e '2{s/ /\n/g;/^$/!p;}' -- |
  51 sort -u |
  52 sed -e 's/\(.*\)/#define __KSYM_\1 1/' >> "$new_ksyms_file"
  53
  54 # Special case for modversions (see modpost.c)
  55 if [ -n "$CONFIG_MODVERSIONS" ]; then
  56         echo "#define __KSYM_module_layout 1" >> "$new_ksyms_file"
  57 fi
  58
  59 # Extract changes between old and new list and touch corresponding
  60 # dependency files.
  61 changed=$(
  62 count=0
  63 sort "$cur_ksyms_file" "$new_ksyms_file" | uniq -u |
  64 sed -n 's/^#define __KSYM_\(.*\) 1/\1/p' | tr "A-Z_" "a-z/" |
  65 while 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 $((count += 1))
  78 done | tail -1 )
  79 changed=${changed:-0}
  80
  81 if [ $changed -gt 0 ]; then
  82         # Replace the old list with tne new one
  83         old=$(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 $@
  90 else
  91         rm -f "$new_ksyms_file"
  92 fi