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@xxxxxxxxxxx>
Tested-by: Matthias Maennich <maennich@xxxxxxxxxx>
Reviewed-by: Matthias Maennich <maennich@xxxxxxxxxx>
Signed-off-by: Quentin Perret <qperret@xxxxxxxxxx>
---
Makefile | 7 +++++--
scripts/gen_autoksyms.sh | 3 ++-
2 files changed, 7 insertions(+), 3 deletions(-)
diff --git a/Makefile b/Makefile
index 1a1a0d271697..c690a838d537 100644
--- a/Makefile
+++ b/Makefile
@@ -1063,9 +1063,12 @@ 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)
diff --git a/scripts/gen_autoksyms.sh b/scripts/gen_autoksyms.sh
index ef46200c366b..16c0b2ddaa4c 100755
--- a/scripts/gen_autoksyms.sh
+++ b/scripts/gen_autoksyms.sh
@@ -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 |
--
2.25.1.481.gfbce0eb801-goog
