Makefile

obj-m += nv_peer_mem.o

OFA_KERNEL=$(shell (test -d /usr/src/ofa_kernel/default && echo /usr/src/ofa_kernel/default) || (test -d /var/lib/dkms/mlnx-ofed-kernel/ && ls -d /var/lib/dkms/mlnx-ofed-kernel/*/build))

ccflags-y += -I$(OFA_KERNEL)/include/ -I$(OFA_KERNEL)/include/rdma

NVIDIA ?= $(shell (find /usr/src/nvidia-* -name "nv-p2p.h"|xargs dirname))
ccflags-y +=-I$(NVIDIA)

PWD  := $(shell pwd)
KVER := $(shell uname -r)
MODULES_DIR := /lib/modules/$(KVER)
KDIR := $(MODULES_DIR)/build
MODULE_DESTDIR := $(MODULES_DIR)/extra/
DEPMOD := /sbin/depmod

# GCC earlier than 4.6.0 will build modules which require 'mcount',
# and this symbol will not be available in the kernel if the kernel was
# compiled with GCC 4.6.0 and above.
# therefore, to prevent unknown symbol issues we disable function tracing.
#
CC  = $(CROSS_COMPILE)gcc
CPP = $(CC) -E

CPP_MAJOR := $(shell $(CPP) -dumpversion 2>&1 | cut -d'.' -f1)
CPP_MINOR := $(shell $(CPP) -dumpversion 2>&1 | cut -d'.' -f2)
CPP_PATCH := $(shell $(CPP) -dumpversion 2>&1 | cut -d'.' -f3)
# Assumes that major, minor, and patch cannot exceed 999
CPP_VERS  := $(shell expr 0$(CPP_MAJOR) \* 1000000 + 0$(CPP_MINOR) \* 1000 + 0$(CPP_PATCH))
compile_h=$(shell /bin/ls -1 $(KDIR)/include/*/compile.h 2> /dev/null | head -1)
ifneq ($(compile_h),)
KERNEL_GCC_MAJOR := $(shell grep LINUX_COMPILER $(compile_h) | sed -r -e 's/.*gcc version ([0-9\.\-]*) .*/\1/g' | cut -d'.' -f1)
KERNEL_GCC_MINOR := $(shell grep LINUX_COMPILER $(compile_h) | sed -r -e 's/.*gcc version ([0-9\.\-]*) .*/\1/g' | cut -d'.' -f2)
KERNEL_GCC_PATCH := $(shell grep LINUX_COMPILER $(compile_h) | sed -r -e 's/.*gcc version ([0-9\.\-]*) .*/\1/g' | cut -d'.' -f3)
KERNEL_GCC_VER  := $(shell expr 0$(KERNEL_GCC_MAJOR) \* 1000000 + 0$(KERNEL_GCC_MINOR) \* 1000 + 0$(KERNEL_GCC_PATCH))
ifneq ($(shell if [ $(CPP_VERS) -lt 4006000 ] && [ $(KERNEL_GCC_VER) -ge 4006000 ]; then \
                             echo "YES"; else echo ""; fi),)
$(info Warning: The kernel was compiled with GCC newer than 4.6.0, while the current GCC is older than 4.6.0, Disabling function tracing to prevent unknown symbol issues...)
override MAKE_PARAMS += CONFIG_FUNCTION_TRACER= CONFIG_HAVE_FENTRY=
endif
endif

KERNEL_VER?=$(shell uname -r)
all:
	cp -rf $(OFA_KERNEL)/Module.symvers .
	make -C $(KDIR) $(MAKE_PARAMS) M=$(PWD) modules

clean:
	make -C $(KDIR)  M=$(PWD) clean

install:
	mkdir -p $(DESTDIR)/$(MODULE_DESTDIR);
	cp -f $(PWD)/nv_peer_mem.ko $(DESTDIR)/$(MODULE_DESTDIR);
	if [ ! -n "$(DESTDIR)" ]; then $(DEPMOD) -r -ae $(KVER);fi;

uninstall:
	/bin/rm -f $(DESTDIR)/$(MODULE_DESTDIR)/nv_peer_mem.ko
	if [ ! -n "$(DESTDIR)" ]; then $(DEPMOD) -r -ae $(KVER);fi;