Commit 88694cff authored by Quentin Perret's avatar Quentin Perret Committed by Masahiro Yamada

kbuild: generate autoksyms.h early

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: default avatarNicolas Pitre <nico@fluxnic.net>
Tested-by: default avatarMatthias Maennich <maennich@google.com>
Reviewed-by: default avatarMatthias Maennich <maennich@google.com>
Signed-off-by: default avatarQuentin Perret <qperret@google.com>
Signed-off-by: default avatarMasahiro Yamada <masahiroy@kernel.org>
parent cd195bc4
......@@ -1066,9 +1066,12 @@ endif
autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
quiet_cmd_autoksyms_h = GEN $@
cmd_autoksyms_h = mkdir -p $(dir $@); \
$(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
$(autoksyms_h):
$(Q)mkdir -p $(dir $@)
$(Q)touch $@
$(call cmd,autoksyms_h)
ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
......
......@@ -39,7 +39,8 @@ cat > "$output_file" << EOT
EOT
sed 's/ko$/mod/' modules.order |
[ -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 |
......
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