Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
21set -e
22
23cur_ksyms_file="include/generated/autoksyms.h"
24new_ksyms_file="include/generated/autoksyms.h.tmpnew"
25
26info() {
27 if [ "$quiet" != "silent_" ]; then
28 printf " %-7s %s\n" "$1" "$2"
29 fi
30}
31
32info "CHK" "$cur_ksyms_file"
33
34# Use "make V=1" to debug this script.
35case "$KBUILD_VERBOSE" in
36*1*)
37 set -x
38 ;;
39esac
40
41# We need access to CONFIG_ symbols
42case "${KCONFIG_CONFIG}" in
43*/*)
44 . "${KCONFIG_CONFIG}"
45 ;;
46*)
47 # Force using a file from the current directory
48 . "./${KCONFIG_CONFIG}"
49esac
50
51# Generate a new ksym list file with symbols needed by the current
52# set of modules.
53cat > "$new_ksyms_file" << EOT
54/*
55 * Automatically generated file; DO NOT EDIT.
56 */
57
58EOT
59[ "$(ls -A "$MODVERDIR")" ] &&
60for mod in "$MODVERDIR"/*.mod; do
61 sed -n -e '3{s/ /\n/g;/^$/!p;}' "$mod"
62done | sort -u |
63while read sym; do
64 if [ -n "$CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX" ]; then
65 sym="${sym#_}"
66 fi
67 echo "#define __KSYM_${sym} 1"
68done >> "$new_ksyms_file"
69
70# Special case for modversions (see modpost.c)
71if [ -n "$CONFIG_MODVERSIONS" ]; then
72 echo "#define __KSYM_module_layout 1" >> "$new_ksyms_file"
73fi
74
75# Extract changes between old and new list and touch corresponding
76# dependency files.
77changed=$(
78count=0
79sort "$cur_ksyms_file" "$new_ksyms_file" | uniq -u |
80sed -n 's/^#define __KSYM_\(.*\) 1/\1/p' | tr "A-Z_" "a-z/" |
81while read sympath; do
82 if [ -z "$sympath" ]; then continue; fi
83 depfile="include/ksym/${sympath}.h"
84 mkdir -p "$(dirname "$depfile")"
85 touch "$depfile"
86 # Filesystems with coarse time precision may create timestamps
87 # equal to the one from a file that was very recently built and that
88 # needs to be rebuild. Let's guard against that by making sure our
89 # dep files are always newer than the first file we created here.
90 while [ ! "$depfile" -nt "$new_ksyms_file" ]; do
91 touch "$depfile"
92 done
93 echo $((count += 1))
94done | tail -1 )
95changed=${changed:-0}
96
97if [ $changed -gt 0 ]; then
98 # Replace the old list with tne new one
99 old=$(grep -c "^#define __KSYM_" "$cur_ksyms_file" || true)
100 new=$(grep -c "^#define __KSYM_" "$new_ksyms_file" || true)
101 info "KSYMS" "symbols: before=$old, after=$new, changed=$changed"
102 info "UPD" "$cur_ksyms_file"
103 mv -f "$new_ksyms_file" "$cur_ksyms_file"
104 # Then trigger a rebuild of affected source files
105 exec $@
106else
107 rm -f "$new_ksyms_file"
108fi