Resolve compile issues with latest 3.19 stable series kernels.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

This prevents the "Warning: No tracing group detected" message
from lttng when there is no group 'tracing' while using lttng
on the target.

Signed-off-by: John Mehaffey <mehaf@gedanken.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>

Fixed:
lttng-tools-2.6.0: lttng-tools-ptest rdepends on libkmod, but it isn't a build dependency? [build-deps]
lttng-tools-2.6.0: lttng-tools rdepends on libkmod, but it isn't a build dependency? [build-deps]

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

To fix build issues against the v3.19 kernel, we can safely update to
the lttng 2.6 stable branches.

This allows us to drop two backported patches that are already part of
this update.

Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>

commit 3b3f7e785e279 [kernel: Rearrange for 1.8] began the process of
moving the kernel source and build artefacts out of sstate control and
into a shared location.

This changed triggered some workflow issues, as well as bugs related
to the kernel source containing build output, and hence being dirty and
breaking kernel rebuilds.

To solve these issues, and to make it clear that the kernel is not under
sstate control, we move the source and build outputs to:

  work-shared/MACHINE/kernel-source
  work-shared/MACHINE/kernel-build-artifacts

Where kernel-build-artifacts is the kernel build output and
kernel-source is kept "pristine". The build-artifacts contain everything
that is required to build external modules against the kernel source,
and includes the defconfig, the kernel-abiversion, System.map files and
output from "make scripts".

External module builds should either pass O= on the command line, or
set KBUILD_OUTPUT to point to the build-artifacts. module-base.bbclass
takes care of setting KBUILD_OUTPUT, so most existing external module
recipes are transparently adapted to the new source/build layout.

recipes that depend on the kernel source must have a depedency on the
do_shared_workdir task:

 do_configure[depends] += "virtual/kernel:do_shared_workdir"

With this dependency added, the STAGING_KERNEL_DIR will be populated and
available to the rest of the build.

Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

This update the source code to the 2.5.2 version and also brings two
fixes from stable-2.5 branch. The update also allowed the removal of
some already applied patches from the metadata.

Doing this update, it fixes following build error:

,----
| make[1]: Entering directory `.../build-framebuffer/tmp/sysroots/imx23evk/usr/src/kernel'
|
|   ERROR: Kernel configuration is invalid.
|          include/generated/autoconf.h or include/config/auto.conf are missing.
|          Run 'make oldconfig && make prepare' on kernel src to fix it.
|
|   Building modules, stage 2.
| ./scripts/Makefile.modpost:42: include/config/auto.conf: No such file or directory
| make[2]: *** No rule to make target `include/config/auto.conf'.  Stop.
| make[1]: *** [modules] Error 2
| make[1]: Leaving directory `.../build-framebuffer/tmp/sysroots/imx23evk/usr/src/kernel'
| make: *** [default] Error 2
`----

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>