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