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alex.forencich

Member

Registered: 2011-05-29

Posts: 96

Proper method for building kernel modules? [solved]

I am attempting to build a custom kernel module for a PCI express interface to an FPGA.  However, I seem to be running into some issues with getting the standard kernel module makefile to work correctly.  Here is my makefile:

# object files to build
obj-m += nnic.o
nic-objs += nnic_driver.o

all:
	make -C /lib/modules/$(shell uname -r)/build M=$(pwd) modules

clean:
	make -C /lib/modules/$(shell uname -r)/build M=$(pwd) clean

However, the first time I ran 'make', I got this output:

make -C /lib/modules/3.14.1-1-ARCH/build M= modules
make[1]: Entering directory '/usr/lib/modules/3.14.1-1-ARCH/build'
Makefile:608: Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: -fstack-protector not supported by compiler
scripts/kconfig/conf --silentoldconfig Kconfig

*** Error during update of the configuration.

/usr/lib/modules/3.14.1-1-ARCH/build/scripts/kconfig/Makefile:36: recipe for target 'silentoldconfig' failed
make[3]: *** [silentoldconfig] Error 1
/usr/lib/modules/3.14.1-1-ARCH/build/Makefile:512: recipe for target 'silentoldconfig' failed
make[2]: *** [silentoldconfig] Error 2
scripts/Makefile.build:44: /usr/lib/modules/3.14.1-1-ARCH/build/arch/x86/syscalls/Makefile: No such file or directory
make[2]: *** No rule to make target '/usr/lib/modules/3.14.1-1-ARCH/build/arch/x86/syscalls/Makefile'.  Stop.
/usr/lib/modules/3.14.1-1-ARCH/build/arch/x86/Makefile:183: recipe for target 'archheaders' failed
make[1]: *** [archheaders] Error 2
make[1]: Leaving directory '/usr/lib/modules/3.14.1-1-ARCH/build'
Makefile:7: recipe for target 'all' failed
make: *** [all] Error 2

After poking around online, I decided to try running make as root.  I got the following output:

make -C /lib/modules/3.14.1-1-ARCH/build M= modules
make[1]: Entering directory '/usr/lib/modules/3.14.1-1-ARCH/build'
scripts/kconfig/conf --silentoldconfig Kconfig
scripts/Makefile.build:44: /usr/lib/modules/3.14.1-1-ARCH/build/arch/x86/syscalls/Makefile: No such file or directory
make[2]: *** No rule to make target '/usr/lib/modules/3.14.1-1-ARCH/build/arch/x86/syscalls/Makefile'.  Stop.
/usr/lib/modules/3.14.1-1-ARCH/build/arch/x86/Makefile:183: recipe for target 'archheaders' failed
make[1]: *** [archheaders] Error 2
make[1]: Leaving directory '/usr/lib/modules/3.14.1-1-ARCH/build'
Makefile:7: recipe for target 'all' failed
make: *** [all] Error 2

Now, when runing 'make' as a normal user, I get:

make -C /lib/modules/3.14.1-1-ARCH/build M= modules
make[1]: Entering directory '/usr/lib/modules/3.14.1-1-ARCH/build'
Makefile:608: Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: -fstack-protector not supported by compiler
scripts/Makefile.build:44: /usr/lib/modules/3.14.1-1-ARCH/build/arch/x86/syscalls/Makefile: No such file or directory
make[2]: *** No rule to make target '/usr/lib/modules/3.14.1-1-ARCH/build/arch/x86/syscalls/Makefile'.  Stop.
/usr/lib/modules/3.14.1-1-ARCH/build/arch/x86/Makefile:183: recipe for target 'archheaders' failed
make[1]: *** [archheaders] Error 2
make[1]: Leaving directory '/usr/lib/modules/3.14.1-1-ARCH/build'
Makefile:7: recipe for target 'all' failed
make: *** [all] Error 2

I have the linux-headers package installed.  I do not need to build the whole kernel, only this small module.  What am I missing here?  What is the correct procedure for this?

Last edited by alex.forencich (2014-04-25 08:16:31)

alex.forencich

Member

Registered: 2011-05-29

Posts: 96

Re: Proper method for building kernel modules? [solved]

Sigh, found the problem.  Should be $(PWD) and not $(pwd) in my makefile.