summaryrefslogtreecommitdiffstats
path: root/Makefile
diff options
context:
space:
mode:
authorQuentin Perret <qperret@google.com>2020-02-28 17:20:15 +0000
committerMasahiro Yamada <masahiroy@kernel.org>2020-03-03 20:49:21 +0900
commit88694cff4952dba60227f421884ff4140d296900 (patch)
tree445ff14922494b49f026b0b7b81f31c296d7724a /Makefile
parentcd195bc4775a5c07620bbb6fc19c4fa254b62b19 (diff)
downloadlinux-88694cff4952dba60227f421884ff4140d296900.tar.bz2
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: 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>
Diffstat (limited to 'Makefile')
-rw-r--r--Makefile7
1 files changed, 5 insertions, 2 deletions
diff --git a/Makefile b/Makefile
index 5435d11d8276..f8b70cf80d79 100644
--- a/Makefile
+++ b/Makefile
@@ -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)