linux-stable/scripts/adjust_autoksyms.sh
Masahiro Yamada bc7cd2dd1f kbuild: redo fake deps at include/ksym/*.h
Commit 0e0345b77a ("kbuild: redo fake deps at include/config/*.h")
simplified the Kconfig/fixdep interaction a lot.

For CONFIG_FOO_BAR_BAZ, Kconfig now touches include/config/FOO_BAR_BAZ
instead of the previous include/config/foo/bar/baz.h .

This commit simplifies the TRIM_UNUSED_KSYMS feature in a similar way:

  - delete .h suffix
  - delete tolower()
  - put everything in 1 directory

For EXPORT_SYMBOL(FOO_BAR_BAZ), scripts/adjust_autoksyms.sh now touches
include/ksym/FOO_BAR_BAZ instead of include/ksym/foo/bar/baz.h .

This is more precise, avoiding possibly unnecessary rebuilds.

  EXPORT_SYMBOL(FOO_BAR_BAZ)
  EXPORT_SYMBOL(_FOO_BAR_BAZ)
  EXPORT_SYMBOL(__FOO_BAR_BAZ)

were previously mapped to the same header, include/ksym/foo/bar/baz.h
but now are handled separately.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
2021-09-03 08:17:21 +09:00

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#!/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
# 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' |
while read sympath; do
if [ -z "$sympath" ]; then continue; fi
depfile="include/ksym/${sympath}"
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