mirror of
https://github.com/torvalds/linux.git
synced 2024-12-27 05:11:48 +00:00
88694cff49
When doing a cold build, autoksyms.h starts empty, and is updated late in the build process to have visibility over the symbols used by in-tree drivers. But since the symbol whitelist is known upfront, it can be used to pre-populate autoksyms.h and maximize the amount of code that can be compiled to its final state in a single pass, hence reducing build time. Do this by using gen_autoksyms.sh to initialize autoksyms.h instead of creating an empty file. Acked-by: Nicolas Pitre <nico@fluxnic.net> Tested-by: Matthias Maennich <maennich@google.com> Reviewed-by: Matthias Maennich <maennich@google.com> Signed-off-by: Quentin Perret <qperret@google.com> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
53 lines
1.3 KiB
Bash
Executable File
53 lines
1.3 KiB
Bash
Executable File
#!/bin/sh
|
|
# SPDX-License-Identifier: GPL-2.0-only
|
|
|
|
# Create an autoksyms.h header file from the list of all module's needed symbols
|
|
# as recorded on the second line of *.mod files and the user-provided symbol
|
|
# whitelist.
|
|
|
|
set -e
|
|
|
|
output_file="$1"
|
|
|
|
# Use "make V=1" to debug this script.
|
|
case "$KBUILD_VERBOSE" in
|
|
*1*)
|
|
set -x
|
|
;;
|
|
esac
|
|
|
|
# We need access to CONFIG_ symbols
|
|
. include/config/auto.conf
|
|
|
|
ksym_wl=/dev/null
|
|
if [ -n "$CONFIG_UNUSED_KSYMS_WHITELIST" ]; then
|
|
# Use 'eval' to expand the whitelist path and check if it is relative
|
|
eval ksym_wl="$CONFIG_UNUSED_KSYMS_WHITELIST"
|
|
[ "${ksym_wl}" != "${ksym_wl#/}" ] || ksym_wl="$abs_srctree/$ksym_wl"
|
|
if [ ! -f "$ksym_wl" ] || [ ! -r "$ksym_wl" ]; then
|
|
echo "ERROR: '$ksym_wl' whitelist file not found" >&2
|
|
exit 1
|
|
fi
|
|
fi
|
|
|
|
# Generate a new ksym list file with symbols needed by the current
|
|
# set of modules.
|
|
cat > "$output_file" << EOT
|
|
/*
|
|
* Automatically generated file; DO NOT EDIT.
|
|
*/
|
|
|
|
EOT
|
|
|
|
[ -f modules.order ] && modlist=modules.order || modlist=/dev/null
|
|
sed 's/ko$/mod/' $modlist |
|
|
xargs -n1 sed -n -e '2{s/ /\n/g;/^$/!p;}' -- |
|
|
cat - "$ksym_wl" |
|
|
sort -u |
|
|
sed -e 's/\(.*\)/#define __KSYM_\1 1/' >> "$output_file"
|
|
|
|
# Special case for modversions (see modpost.c)
|
|
if [ -n "$CONFIG_MODVERSIONS" ]; then
|
|
echo "#define __KSYM_module_layout 1" >> "$output_file"
|
|
fi
|