Documentation/features/scripts/features-refresh.sh

   1 #
   2 # Small script that refreshes the kernel feature support status in place.
   3 #
   4
   5 for F_FILE in Documentation/features/*/*/arch-support.txt; do
   6         F=$(grep "^#         Kconfig:" "$F_FILE" | cut -c26-)
   7
   8         #
   9         # Each feature F is identified by a pair (O, K), where 'O' can
  10         # be either the empty string (for 'nop') or "not" (the logical
  11         # negation operator '!'); other operators are not supported.
  12         #
  13         O=""
  14         K=$F
  15         if [[ "$F" == !* ]]; then
  16                 O="not"
  17                 K=$(echo $F | sed -e 's/^!//g')
  18         fi
  19
  20         #
  21         # F := (O, K) is 'valid' iff there is a Kconfig file (for some
  22         # arch) which contains K.
  23         #
  24         # Notice that this definition entails an 'asymmetry' between
  25         # the case 'O = ""' and the case 'O = "not"'. E.g., F may be
  26         # _invalid_ if:
  27         #
  28         # [case 'O = ""']
  29         #   1) no arch provides support for F,
  30         #   2) K does not exist (e.g., it was renamed/mis-typed);
  31         #
  32         # [case 'O = "not"']
  33         #   3) all archs provide support for F,
  34         #   4) as in (2).
  35         #
  36         # The rationale for adopting this definition (and, thus, for
  37         # keeping the asymmetry) is:
  38         #
  39         #       We want to be able to 'detect' (2) (or (4)).
  40         #
  41         # (1) and (3) may further warn the developers about the fact
  42         # that K can be removed.
  43         #
  44         F_VALID="false"
  45         for ARCH_DIR in arch/*/; do
  46                 K_FILES=$(find $ARCH_DIR -name "Kconfig*")
  47                 K_GREP=$(grep "$K" $K_FILES)
  48                 if [ ! -z "$K_GREP" ]; then
  49                         F_VALID="true"
  50                         break
  51                 fi
  52         done
  53         if [ "$F_VALID" = "false" ]; then
  54                 printf "WARNING: '%s' is not a valid Kconfig\n" "$F"
  55         fi
  56
  57         T_FILE="$F_FILE.tmp"
  58         grep "^#" $F_FILE > $T_FILE
  59         echo "    -----------------------" >> $T_FILE
  60         echo "    |         arch |status|" >> $T_FILE
  61         echo "    -----------------------" >> $T_FILE
  62         for ARCH_DIR in arch/*/; do
  63                 ARCH=$(echo $ARCH_DIR | sed -e 's/arch//g' | sed -e 's/\///g')
  64                 K_FILES=$(find $ARCH_DIR -name "Kconfig*")
  65                 K_GREP=$(grep "$K" $K_FILES)
  66                 #
  67                 # Arch support status values for (O, K) are updated according
  68                 # to the following rules.
  69                 #
  70                 #   - ("", K) is 'supported by a given arch', if there is a
  71                 #     Kconfig file for that arch which contains K;
  72                 #
  73                 #   - ("not", K) is 'supported by a given arch', if there is
  74                 #     no Kconfig file for that arch which contains K;
  75                 #
  76                 #   - otherwise: preserve the previous status value (if any),
  77                 #                default to 'not yet supported'.
  78                 #
  79                 # Notice that, according these rules, invalid features may be
  80                 # updated/modified.
  81                 #
  82                 if [ "$O" = "" ] && [ ! -z "$K_GREP" ]; then
  83                         printf "    |%12s: |  ok  |\n" "$ARCH" >> $T_FILE
  84                 elif [ "$O" = "not" ] && [ -z "$K_GREP" ]; then
  85                         printf "    |%12s: |  ok  |\n" "$ARCH" >> $T_FILE
  86                 else
  87                         S=$(grep -v "^#" "$F_FILE" | grep " $ARCH:")
  88                         if [ ! -z "$S" ]; then
  89                                 echo "$S" >> $T_FILE
  90                         else
  91                                 printf "    |%12s: | TODO |\n" "$ARCH" \
  92                                         >> $T_FILE
  93                         fi
  94                 fi
  95         done
  96         echo "    -----------------------" >> $T_FILE
  97         mv $T_FILE $F_FILE
  98 done