android_kernel_xiaomi_sm8450/scripts/adjust_autoksyms.sh
Raghavendra Rao Ananta 9ec36c01e0 kbuild: Add support for CONFIG_UNUSED_KSYMS_WHITELIST_ONLY
CONFIG_UNUSED_KSYMS_WHITELIST_ONLY extends the support for the
existing CONFIG_UNUSED_KSYMS_WHITELIST in a way that, if enabled,
it would allow the kbuild to export ONLY the symbols that are
supplied as a part of whitelist (and of course the ones exported
by modules). That is, the build would break for modules during
modpost with:
ERROR: "<symbol>" [<module>.ko] undefined!

When enabled, the option is quite useful in build integration
systems to detect if the whitelist file needs an update.

Change-Id: Ica0a270214d4d51f6e2269fdc591fb86acbc4f97
Signed-off-by: Raghavendra Rao Ananta <rananta@codeaurora.org>
2020-05-12 09:40:12 -07:00

77 lines
2.2 KiB
Bash
Executable File

#!/bin/sh
# SPDX-License-Identifier: GPL-2.0-only
# Script to update include/generated/autoksyms.h and dependency files
#
# Copyright: (C) 2016 Linaro Limited
# Created by: Nicolas Pitre, January 2016
#
# Update the include/generated/autoksyms.h file.
#
# For each symbol being added or removed, the corresponding dependency
# file's timestamp is updated to force a rebuild of the affected source
# file. All arguments passed to this script are assumed to be a command
# to be exec'd to trigger a rebuild of those files.
set -e
cur_ksyms_file="include/generated/autoksyms.h"
new_ksyms_file="include/generated/autoksyms.h.tmpnew"
info() {
if [ "$quiet" != "silent_" ]; then
printf " %-7s %s\n" "$1" "$2"
fi
}
info "CHK" "$cur_ksyms_file"
# Use "make V=1" to debug this script.
case "$KBUILD_VERBOSE" in
*1*)
set -x
;;
esac
# We need access to CONFIG_ symbols
. include/config/auto.conf
# Generate a new symbol list file
$CONFIG_SHELL $srctree/scripts/gen_autoksyms.sh "$new_ksyms_file"
# Extract changes between old and new list and touch corresponding
# dependency files.
changed=$(
count=0
sort "$cur_ksyms_file" "$new_ksyms_file" | uniq -u |
sed -n 's/^#define __KSYM_\(.*\) 1/\1/p' | tr "A-Z_" "a-z/" |
while read sympath; do
if [ -z "$sympath" ]; then continue; fi
depfile="include/ksym/${sympath}.h"
mkdir -p "$(dirname "$depfile")"
touch "$depfile"
# Filesystems with coarse time precision may create timestamps
# equal to the one from a file that was very recently built and that
# needs to be rebuild. Let's guard against that by making sure our
# dep files are always newer than the first file we created here.
while [ ! "$depfile" -nt "$new_ksyms_file" ]; do
touch "$depfile"
done
echo $((count += 1))
done | tail -1 )
changed=${changed:-0}
if [ $changed -gt 0 ]; then
# Replace the old list with tne new one
old=$(grep -c "^#define __KSYM_" "$cur_ksyms_file" || true)
new=$(grep -c "^#define __KSYM_" "$new_ksyms_file" || true)
info "KSYMS" "symbols: before=$old, after=$new, changed=$changed"
info "UPD" "$cur_ksyms_file"
mv -f "$new_ksyms_file" "$cur_ksyms_file"
# Then trigger a rebuild of affected source files
exec $@
else
rm -f "$new_ksyms_file"
fi