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| author | Masahiro Yamada <yamada.masahiro@socionext.com> | 2019-01-10 23:11:39 +0900 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2019-01-15 15:28:52 -0500 |
| commit | 0b588deffe5f925dbef96945e6c3b5ab65be6a33 (patch) | |
| tree | b12c58f0fa7a770eaa9155ce045ca2e12bd152b6 /Makefile | |
| parent | c4448bdc4fb398478bc8499cfcf85fca3c36ad08 (diff) | |
| download | u-boot-0b588deffe5f925dbef96945e6c3b5ab65be6a33.tar.gz | |
kbuild: fix parallel build race caused by u-boot.cfg regeneration
Multiple people have reported intermittent build failure in parallel
building.
Kever Yang reported this issue some time ago [1], but I could not
get enough clue at that time.
This time, Richard Purdie provided a full build log [2], which was
very helpful for me to root-cause it.
The cause of the problem is commit 0d982c585330 ("Makefile: add
dependencies to regenerate u-boot.cfg when lost").
That commit added the 'cfg' as the prerequisite of the 'all' target,
so the parallel build tries to run it simultaneously, then regenerates
a symlink while building objects.
When u-boot.cfg is accidentally lost, let's rebuild it before
descending into any subdirectories.
Also, what is annoying is u-boot.cfg is currently regenerated every
time since it depends on FORCE. We can get rid of all the prerequisites
of u-boot.cfg because u-boot.cfg is rebuilt anyway as the byproduct of
auto.conf when a user updates the .config file.
[1] https://lists.denx.de/pipermail/u-boot/2018-June/330341.html
[2] https://autobuilder.yoctoproject.org/typhoon/#/builders/65/builds/160/steps/7/logs/step1b
Fixes: 0d982c585330 ("Makefile: add dependencies to regenerate u-boot.cfg when lost")
Reported-by: Kever Yang <kever.yang@rock-chips.com>
Reported-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'Makefile')
| -rw-r--r-- | Makefile | 6 |
1 files changed, 3 insertions, 3 deletions
@@ -534,7 +534,7 @@ include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd @# Otherwise, 'make silentoldconfig' would be invoked twice. $(Q)touch include/config/auto.conf -u-boot.cfg spl/u-boot.cfg tpl/u-boot.cfg: include/config.h FORCE +u-boot.cfg spl/u-boot.cfg tpl/u-boot.cfg: $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.autoconf $(@) -include include/autoconf.mk @@ -910,7 +910,7 @@ quiet_cmd_cfgcheck = CFGCHK $2 cmd_cfgcheck = $(srctree)/scripts/check-config.sh $2 \ $(srctree)/scripts/config_whitelist.txt $(srctree) -all: $(ALL-y) cfg +all: $(ALL-y) ifeq ($(CONFIG_DM_I2C_COMPAT)$(CONFIG_SANDBOX),y) @echo >&2 "===================== WARNING ======================" @echo >&2 "This board uses CONFIG_DM_I2C_COMPAT. Please remove" @@ -1555,7 +1555,7 @@ ifneq ($(KBUILD_SRC),) endif # prepare2 creates a makefile if using a separate output directory -prepare2: prepare3 outputmakefile +prepare2: prepare3 outputmakefile cfg prepare1: prepare2 $(version_h) $(timestamp_h) \ include/config/auto.conf |