vhost: build eventfd_link module against specified kernel

The vHost eventlink driver is a kernel module that requires a kernel
source/build directory to build the ko. Convert the fixed kernel build
directory specifier to one which may be user specified on the command-line.

Signed-off-by: Aaron Conole <aconole@redhat.com>

diff --git a/lib/librte_vhost/eventfd_link/Makefile b/lib/librte_vhost/eventfd_link/Makefile
index fc3927b..3140e8b 100644 (file)
--- a/lib/librte_vhost/eventfd_link/Makefile
+++ b/lib/librte_vhost/eventfd_link/Makefile
@@ -29,11 +29,13 @@
 #   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 #   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+RTE_KERNELDIR ?= /lib/modules/$(shell uname -r)/build
+
 obj-m += eventfd_link.o
 
 
 all:
-       make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
+       make -C $(RTE_KERNELDIR) M=$(PWD) modules
 
 clean:
-       make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean
+       make -C $(RTE_KERNELDIR) M=$(PWD) clean