Commit 47801c97 authored by Masahiro Yamada's avatar Masahiro Yamada
Browse files

kbuild: revive single target %.ko 



I removed the single target %.ko in commit ff9b45c5 ("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: ff9b45c5 ("kbuild: modpost: read modules.order instead of $(MODVERDIR)/*.mod")
Reported-by: default avatarDon Brace <don.brace@microsemi.com>
Reported-by: default avatarArend Van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: default avatarMasahiro Yamada <yamada.masahiro@socionext.com>
parent e21a712a

Makefile

+11 −0
Original line number Diff line number Diff line
@@ -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 += /

scripts/Makefile.modpost

+2 −4
Original line number Diff line number Diff line
@@ -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:

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