如何在内核模块Makefile中提供包含目录路径

Question

I was learning kernel interrupt using a small demo kernel module which use these two header include

asm/exception.h
asm/mach/irq.h

My Makefile is

ifeq (${KERNELRELEASE},)

    KERNEL_SOURCE := /lib/modules/$(shell uname -r)/build

    PWD := $(shell pwd)


default:
    make    -C ${KERNEL_SOURCE} SUBDIRS=${PWD} modules 

clean:
    make    -C ${KERNEL_SOURCE} SUBDIRS=${PWD} clean



else

obj-m := irq_demo.o

endif

The error I am getting

irq_demo.c:9:27: fatal error: asm/exception.h: No such file or directory
 #include <asm/exception.h>

I found asm/exception.h in my system in /usr/src/linux-headers-3.16.0-30-generic/arch/arm/include/

• [1]But how to include this path in Makefile

• [2]Is /usr/src/linux-headers-3.16.0-30-generic/include/asm-generic/ linked with arch/arm/include/asm/ ? if yes , than How ?

Answer 1

First try adding ARCH=arm after make ie

make ARCH=arm -C ${KERNEL_SOURCE} SUBDIRS=${PWD} modules 

============================= OR =============================

Can you try adding line before make

CARGS = -I /lib/modules/$(shell uname -r)/arch/arm/include/
make  $(CARGS) -C ${KERNEL_SOURCE} SUBDIRS=${PWD} modules