lttng-modules: Add version 2.4.0

This updates lttng-modules to 2.4.0, codenamed Époque Opaque, needed
for interoperability with the 3.14 (dev) kernel.

(From OE-Core rev: bc9a310f920ae17330c749f2263f884423e9b050)

Signed-off-by: Tom Zanussi <tom.zanussi@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-kernel/lttng/lttng-modules_2.4.0.bb

@@ -0,0 +1,34 @@
+SECTION = "devel"
+SUMMARY = "Linux Trace Toolkit KERNEL MODULE"
+DESCRIPTION = "The lttng-modules 2.0 package contains the kernel tracer modules"
+LICENSE = "LGPLv2.1 & GPLv2"
+LIC_FILES_CHKSUM = "file://LICENSE;md5=1412caf5a1aa90d6a48588a4794c0eac \
+                    file://gpl-2.0.txt;md5=751419260aa954499f7abaabaa882bbe \
+                    file://lgpl-2.1.txt;md5=243b725d71bb5df4a1e5920b344b86ad"
+
+DEPENDS = "virtual/kernel"
+
+inherit module
+
+SRCREV = "fb2c37799306d16fb590aebee6fad8be431264b7"
+PV = "2.4.0"
+
+SRC_URI = "git://git.lttng.org/lttng-modules.git;branch=stable-2.4 \
+           file://lttng-modules-replace-KERNELDIR-with-KERNEL_SRC.patch"
+
+export INSTALL_MOD_DIR="kernel/lttng-modules"
+export KERNEL_SRC="${STAGING_KERNEL_DIR}"
+
+
+S = "${WORKDIR}/git"
+
+do_install_append() {
+	# Delete empty directories to avoid QA failures if no modules were built
+	find ${D}/lib -depth -type d -empty -exec rmdir {} \;
+}
+
+python do_package_prepend() {
+    if not os.path.exists(os.path.join(d.getVar('D', True), 'lib/modules')):
+        bb.warn("%s: no modules were created; this may be due to CONFIG_TRACEPOINTS not being enabled in your kernel." % d.getVar('PN', True))
+}
+