Backport "mm: export generic_pipe_buf_*() to modules".

This patch prepfares for LTTng kmods support, the information
of origial patch are:

   commit f0d902f497ee2fb747086322a31925c7fb351d7a
   Author: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   Date:   Sat Sep 1 17:47:36 2012 -0700

      mm: export generic_pipe_buf_*() to modules

      Backport for 2.6.32.x to 2.6.34.x of commits:

      commit 51921cb746f56983db5a373ca68deb2b0d3ddf01
      Author: Miklos Szeredi <mszeredi@suse.cz>
      Date:   Wed May 26 08:44:22 2010 +0200

         mm: export generic_pipe_buf_*() to modules

         This is needed by fuse device code which wants to create pipe
         buffers.

    Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
    Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Backport-by: Ren Zhen Yu <zhenyu.ren@aliyun-inc.com>
Backport "tracing: Let tracepoints have data passed to  tracepoint callbacks"

This prepare for LTTng kmods support. Totally, this patch backports v2.6.35
tracepoint ABI/API to taobao kernel, which is the reason of odd names like
kabi_2635_tracepoint_*().

The information of original commit is:

    commit 2c2a566b64b4254c530fb0c2222b30e8a739bac9
    Author: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
    Date:   Sat Sep 1 17:45:09 2012 -0700

        Backport of commit 38516ab59fbc5b3bb278cf5e1fe2867c70cff32e for
2.6.32.x and 2.6.33.x. Keeping kABI compatibility.

        Signed-off-by: Mathieu Desnoyers
<mathieu.desnoyers@efficios.com>

Backport-by: Ren Zhen Yu <zhenyu.ren@aliyun-inc.com>