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kbuild: revive single target %.ko

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I removed the single target %.ko in commit ff9b45c55b ("kbuild:
modpost: read modules.order instead of $(MODVERDIR)/*.mod") because
the modpost stage does not work reliably. For instance, the module
dependency, modversion, etc. do not work if we lack symbol information
from the other modules.

Yet, some people still want to build only one module in their interest,
and it may be still useful if it is used within those limitations.

Fixes: ff9b45c55b ("kbuild: modpost: read modules.order instead of $(MODVERDIR)/*.mod")
Reported-by: Don Brace <don.brace@microsemi.com>
Reported-by: Arend Van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
This commit is contained in:
Masahiro Yamada 2019-08-02 19:23:58 +09:00
parent e21a712a96
commit 47801c97de
2 changed files with 13 additions and 4 deletions
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11
Makefile
View File

@ -1002,6 +1002,8 @@ endif
PHONY += prepare0
export MODORDER := $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)modules.order
ifeq ($(KBUILD_EXTMOD),)
core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
@ -1771,6 +1773,15 @@ build-dir = $(patsubst %/,%,$(dir $(build-target)))
$(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
%.symtypes: prepare FORCE
$(Q)$(MAKE) $(build)=$(build-dir) $(build-target)
ifeq ($(KBUILD_EXTMOD),)
# For the single build of an in-tree module, use a temporary file to avoid
# the situation of modules_install installing an invalid modules.order.
%.ko: MODORDER := .modules.tmp
endif
%.ko: prepare FORCE
$(Q)$(MAKE) $(build)=$(build-dir) $(build-target:.ko=.mod)
$(Q)echo $(build-target) > $(MODORDER)
$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
# Modules
PHONY += /

6
scripts/Makefile.modpost
View File

@ -85,10 +85,8 @@ endif
include scripts/Makefile.lib
modorder := $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)modules.order
# find all modules listed in modules.order
modules := $(sort $(shell cat $(modorder)))
modules := $(sort $(shell cat $(MODORDER)))
# Stop after building .o files if NOFINAL is set. Makes compile tests quicker
__modpost: $(if $(KBUILD_MODPOST_NOFINAL), $(modules:.ko:.o),$(modules))
@ -98,7 +96,7 @@ MODPOST += $(subst -i,-n,$(filter -i,$(MAKEFLAGS))) -s -T - $(wildcard vmlinux)
# We can go over command line length here, so be careful.
quiet_cmd_modpost = MODPOST $(words $(modules)) modules
cmd_modpost = sed 's/ko$$/o/' $(modorder) | $(MODPOST)
cmd_modpost = sed 's/ko$$/o/' $(MODORDER) | $(MODPOST)
PHONY += modules-modpost
modules-modpost: