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authorMasahiro Yamada <yamada.masahiro@socionext.com>2018-03-16 16:37:12 +0900
committerMasahiro Yamada <yamada.masahiro@socionext.com>2018-03-26 02:01:22 +0900
commit07a422bb213adb7ee1afbb2347ce6922c60a558a (patch)
treecdc621b641d4afba9b79316c28286324f676f204 /Makefile
parentd8821622c889d9dbc1a31b16e726717394954596 (diff)
downloadlwn-07a422bb213adb7ee1afbb2347ce6922c60a558a.tar.gz
lwn-07a422bb213adb7ee1afbb2347ce6922c60a558a.zip
kbuild: restore autoksyms.h touch to the top Makefile
Commit d3fc425e819b ("kbuild: make sure autoksyms.h exists early") moved the code that touches autoksyms.h to scripts/kconfig/Makefile with obscure reason. From Nicolas' comment [1], he did not seem to be sure about the root cause. I guess I figured it out, so here is a fix-up I think is more correct. According to the error log in the original post [2], the build failed in scripts/mod/devicetable-offsets.c scripts/mod/Makefile is descended from scripts/Makefile, which is invoked from the top-level Makefile by the 'scripts' target. To build vmlinux and/or modules, Kbuild descend into $(vmlinux-dirs). This depends on 'prepare' and 'scripts' as follows: $(vmlinux-dirs): prepare scripts Because there is no dependency between 'prepare' and 'scripts', the parallel building can execute them simultaneously. 'prepare' depends on 'prepare1', which touched autoksyms.h, while 'scripts' descends into script/, then scripts/mod/, which needs <generated/autoksyms.h> if CONFIG_TRIM_UNUSED_KSYMS. It was the reason of the race. I am not happy to have unrelated code in the Kconfig Makefile, so getting it back to the top Makefile. I removed the standalone test target because I want to use it to create an empty autoksyms.h file. Here is a little improvement; unnecessary autoksyms.h is not created when CONFIG_TRIM_UNUSED_KSYMS is disabled. [1] https://lkml.org/lkml/2016/11/30/734 [2] https://lkml.org/lkml/2016/11/30/531 Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Acked-by: Nicolas Pitre <nico@linaro.org>
Diffstat (limited to 'Makefile')
-rw-r--r--Makefile12
1 files changed, 7 insertions, 5 deletions
diff --git a/Makefile b/Makefile
index 5aa07da475bc..b65cfe3bcba8 100644
--- a/Makefile
+++ b/Makefile
@@ -1019,9 +1019,11 @@ ifdef CONFIG_TRIM_UNUSED_KSYMS
"$(MAKE) -f $(srctree)/Makefile vmlinux"
endif
-# standalone target for easier testing
-include/generated/autoksyms.h: FORCE
- $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
+autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
+
+$(autoksyms_h):
+ $(Q)mkdir -p $(dir $@)
+ $(Q)touch $@
ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
@@ -1065,7 +1067,7 @@ include/config/kernel.release: include/config/auto.conf FORCE
# in parallel
PHONY += scripts
scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
- asm-generic gcc-plugins
+ asm-generic gcc-plugins $(autoksyms_h)
$(Q)$(MAKE) $(build)=$(@)
# Things we need to do before we recursively start building the kernel
@@ -1095,7 +1097,7 @@ endif
# that need to depend on updated CONFIG_* values can be checked here.
prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
-prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
+prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
include/config/auto.conf
$(cmd_crmodverdir)