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
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