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| author | Quentin Perret <qperret@google.com> | 2020-02-28 17:20:15 +0000 |
|---|---|---|
| committer | Masahiro Yamada <masahiroy@kernel.org> | 2020-03-03 20:49:21 +0900 |
| commit | 88694cff4952dba60227f421884ff4140d296900 (patch) | |
| tree | 445ff14922494b49f026b0b7b81f31c296d7724a /Makefile | |
| parent | cd195bc4775a5c07620bbb6fc19c4fa254b62b19 (diff) | |
| download | lwn-88694cff4952dba60227f421884ff4140d296900.tar.gz lwn-88694cff4952dba60227f421884ff4140d296900.zip | |
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-- | Makefile | 7 |
1 files changed, 5 insertions, 2 deletions
@@ -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) |