On Sat, Jun 28, 2008 at 3:14 AM, Adrian Bunk <bunk@xxxxxxxxxx> wrote: > On Sat, Jun 28, 2008 at 02:51:51AM +0500, Shaz wrote: >> On Sat, Jun 28, 2008 at 2:32 AM, Adrian Bunk <bunk@xxxxxxxxxx> wrote: >> > On Sat, Jun 28, 2008 at 02:16:14AM +0500, Shaz wrote: >> >> Hi, >> >> >> >> Need to compile an external module as a kernel built-in module. Its >> >> Makefile is set as obj-m meaning as a loadable module so it will be >> >> kept on filesystem separately. This means I have to do obj-y to make >> >> it built-in. But I wanted to know, before I just try it out, that the >> >> Makefile of the kernel module is way too complex for me and there was >> >> an install target which is creating files for miscilleneous functions >> >> of the module and it had a /dev/<module-name>, which means its a >> >> device driver. >> >> >> >> So what do I need to consider apart from the change obj-m to obj-y? >> > >> > It does not work this way. >> >> Are you sure because in kernel top-level Makefile contains SUBDIRS >> symbol for external modules and if it contains a path then target all >> becomes _all else _all becomes modules. Personally, I am not sure of >> this behavior but I think if we can do obj-y instead of obj-m than >> maybe this module is built-in. Sorry you already said it's not >> possible but I am still curious why it doesn't in the light of >> SUBDIRS. > > The reason is simple: > When an external module gets built the kernel image is not rebuilt. Thats what I am trying to say. I am newbie but the following makes sense to me: If the SUBDIRS will take "make" to the external module by setting its value to KBUILD_EXTMOD. Consider the following lines from kernel Makefile: # If building an external module we do not care about the all: rule # but instead _all depend on modules PHONY += all ifeq ($(KBUILD_EXTMOD),) _all: all else _all: modules endif If the module's Makefile consists of obj-y instead of obj-y then its should work. ...? > >> By the way can you suggest how do I workout getting the code inside >> the kernel source. >> >> Analyzing the following from module's Makefile: >> >> all: $(src)/crypto/gmp.h $(src)/crypto/libgmp.a >> @$(MAKE) -C $(KERNEL_BUILD) M=$(CURDIR) modules >> >> I thought maybe if i replace "modules" with "all", it might have the >> same effect as what I suggested in case of SUBDIRS for kernel >> Makefile. > > Where can I find the source for this module? I am not sure what you mean by the source of the module? If you mean source to the module Makefile then here it is: --------------------------------------------- # kernel settings KERNEL_RELEASE := $(shell uname -r) KERNEL_BUILD := /lib/modules/$(KERNEL_RELEASE)/build MOD_SUBDIR := misc # GNU MP configuration GMP_LIB := /usr/lib/libgmp.a GMP_HEADER := /usr/include/gmp.h # sources and objects src ?= . DIRS := . crypto <MODULE_NAME> SRCS := $(foreach dir, $(DIRS), $(wildcard $(src)/$(dir)/*.c)) OBJS := $(patsubst %.c, %.o, $(SRCS)) SRCS += $(foreach dir, $(DIRS), $(wildcard $(src)/$(dir)/*.h)) DISTSRC := ./README ./AUTHORS ./ChangeLog ./Makefile $(SRCS) DISTDIR := <MODULE_NAME>-$(VERSION_MAJOR).$(VERSION_MINOR)$(VERSION_SUFFIX) # module settings MODULE_NAME := <MODULE_NAME> obj-m := $(MODULE_NAME).o $(MODULE_NAME)-objs := $(patsubst $(src)/%.o, %.o, $(OBJS)) crypto/libgmp.a # do not print "Entering directory ..." MAKEFLAGS += --no-print-directory EXTRA_CFLAGS += -Wall -Werror -DDEBUG -I$(src) -I$(src)/crypto -I$(src)/<MODULE_NAME> all: $(src)/crypto/gmp.h $(src)/crypto/libgmp.a @$(MAKE) -C $(KERNEL_BUILD) M=$(CURDIR) all clean: @$(MAKE) -C $(KERNEL_BUILD) M=$(CURDIR) clean rm -f $(src)/crypto/gmp.h $(src)/crypto/libgmp.a $(src)/Modules.symvers install: @$(MAKE) -C $(KERNEL_BUILD) M=$(CURDIR) modules_install test -d /var/<MODULE_NAME> || mkdir /var/<MODULE_NAME> test -c /dev/<MODULE_NAME> || mknod /dev/<MODULE_NAME> c 10 224 depmod -a $(src)/crypto/libgmp.a: test -e $(src)/crypto/libgmp.a || ln -s $(GMP_LIB) $(src)/crypto/libgmp.a # Note: We have to make sure that we use stack-based calling conventions # when using GNU MP library functions $(src)/crypto/gmp.h: test -r $(src)/crypto/gmp.h || cat $(GMP_HEADER) | \ sed -e "s/\(__GMP_DECLSPEC [^e].*\);/\1 __attribute__ ((regparm(0)));/" | \ sed -e "s/^int$$/int __attribute__ ((regparm(0)))/" | \ sed -e "s/^void$$/void __attribute__ ((regparm(0)))/" | \ sed -e "s/^size_t$$/size_t __attribute__ ((regparm(0)))/" | \ sed -e "s/^mp_limb_t$$/mp_limb_t __attribute__ ((regparm(0)))/" | \ sed -e "s/^__GMP_EXTERN_INLINE void$$/__GMP_EXTERN_INLINE void __attribute__ ((regparm(0)))/" | \ sed -e "s/^unsigned long$$/unsigned long __attribute__ ((regparm(0)))/" | \ sed -e "s/\(.* (\*__gmp_allocate_func) .*\);/\1 __attribute__ ((regparm(0)));/" | \ sed -e "s/\(.* (\*__gmp_reallocate_func) .*\);/\1 __attribute__ ((regparm(0)));/" | \ sed -e "s/\(.* (\*__gmp_free_func) .*\);/\1 __attribute__ ((regparm(0)));/" \ > $(src)/crypto/gmp.h .PHONY: all clean install ------------------------------------------ > >> Thanks > > cu > Adrian > > -- > > "Is there not promise of rain?" Ling Tan asked suddenly out > of the darkness. There had been need of rain for many days. > "Only a promise," Lao Er said. > Pearl S. Buck - Dragon Seed > > -- Shaz -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
