[lttng-dev] [PATCH lttng-modules] Fix: disable kvm probe if lapic.h isn't found

[chris.j.arges@canonical.com (Chris J Arges)]

In a typical distribution if just linux-headers is installed, lapic.h will
not be installed. We should check if that file exists and not build the module.

Signed-off-by: Chris J Arges <chris.j.arges at canonical.com>
---
 probes/Makefile | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/probes/Makefile b/probes/Makefile
index 0314a5e..cc4c352 100644
--- a/probes/Makefile
+++ b/probes/Makefile
@@ -25,6 +25,8 @@ obj-m += lttng-probe-statedump.o
 ifneq ($(CONFIG_KVM),)
 obj-m += lttng-probe-kvm.o
 ifneq ($(CONFIG_X86),)
+kvm_dep_lapic = $(srctree)/arch/x86/kvm/lapic.h
+ifneq ($(wildcard $(kvm_dep_lapic)),)
 kvm_dep = $(srctree)/virt/kvm/iodev.h $(srctree)/include/kvm/iodev.h
 ifneq ($(wildcard $(kvm_dep)),)
 CFLAGS_lttng-probe-kvm-x86.o += -I$(srctree)/virt/kvm
@@ -40,6 +42,9 @@ obj-m +=  $(shell \
 else
 $(warning File $(kvm_dep) not found. Probe "kvm" x86-specific is disabled. Use full kernel source tree to enable it.)
 endif
+else
+$(warning File $(kvm_dep_lapic) not found. Probe "kvm" x86-specific is disabled. Use full kernel source tree to enable it.)
+endif
 endif
 endif
 
-- 
2.1.4