[lttng-dev] LTTng wrapper cleanup

[Mathieu Desnoyers]

Hi Greg,

Here is the cleanup of the LTTng wrappers that used kallsyms to lookup
some kernel symbols. I introduce the missing symbols in the mainline
kernel, trying to follow the local exports already in place when it
comes to choosing between EXPORT_SYMBOL and EXPORT_SYMBOL_GPL. I also
removed wrappers that deal with API changes across kernel versions (for
older kernels). Only few wrapper files are left at this point (TODO),
but those are less repulsive than those that used kallsyms:

- inline_memcpy.h: ensures that inline_memcpy is declared on all
  architectures.
- poll.h: see TODO file, "Features" section.
- trace-clock.h: see TODO file, "Features" section.
- ringbuffer: those are internal to the driver. They were there to make
  it easier to switch between the ringbuffer deployed in my own kernel
  tree and the module-specific ringbuffer.

The 3 first patches are small cleanups recommended to me by a static
checker.

Diffstat:

 b/drivers/staging/lttng/lib/ringbuffer/ring_buffer_frontend.c |    6 
 b/drivers/staging/lttng/lib/ringbuffer/ring_buffer_mmap.c     |    3 
 drivers/staging/lttng/lib/ringbuffer/ring_buffer_mmap.c       |    3 
 b/drivers/staging/lttng/lib/ringbuffer/ring_buffer_vfs.c      |    3 
 b/mm/nommu.c                                                  |    1 
 b/mm/vmalloc.c                                                |    1 
 b/drivers/staging/lttng/wrapper/kallsyms.h                    |    2 
 b/drivers/staging/lttng/lib/ringbuffer/ring_buffer_backend.c  |    3 
 b/drivers/staging/lttng/ltt-context.c                         |    1 
 b/drivers/staging/lttng/ltt-debugfs-abi.c                     |    3 
 b/drivers/staging/lttng/ltt-events.c                          |    3 
 b/drivers/staging/lttng/ltt-ring-buffer-client.h              |    3 
 b/drivers/staging/lttng/ltt-ring-buffer-metadata-client.h     |    3 
 b/drivers/staging/lttng/lttng-context-nice.c                  |    3 
 b/drivers/staging/lttng/lttng-context-perf-counters.c         |    3 
 b/drivers/staging/lttng/lttng-context-pid.c                   |    3 
 b/drivers/staging/lttng/lttng-context-ppid.c                  |    3 
 b/drivers/staging/lttng/lttng-context-prio.c                  |    3 
 b/drivers/staging/lttng/lttng-context-procname.c              |    3 
 b/drivers/staging/lttng/lttng-context-tid.c                   |    3 
 b/drivers/staging/lttng/lttng-context-vpid.c                  |    3 
 b/drivers/staging/lttng/lttng-context-vppid.c                 |    3 
 b/drivers/staging/lttng/lttng-context-vtid.c                  |    3 
 b/drivers/staging/lttng/lttng-syscalls.c                      |    2 
 b/drivers/staging/lttng/probes/lttng-events.h                 |    3 
 b/drivers/staging/lttng/probes/lttng-ftrace.c                 |    5 
 b/drivers/staging/lttng/probes/lttng-kprobes.c                |    3 
 b/drivers/staging/lttng/probes/lttng-kretprobes.c             |    3 
 b/drivers/staging/lttng/probes/lttng-types.c                  |    3 
 drivers/staging/lttng/wrapper/vmalloc.h                       |   49 --
 b/fs/splice.c                                                 |    1 
 b/drivers/staging/lttng/lib/Makefile                          |    3 
 b/drivers/staging/lttng/lib/ringbuffer/ring_buffer_splice.c   |    3 
 drivers/staging/lttng/wrapper/splice.c                        |   46 --
 drivers/staging/lttng/wrapper/splice.h                        |   23 -
 drivers/staging/lttng/lttng-context-perf-counters.c           |    9 
 drivers/staging/lttng/wrapper/perf.h                          |   32 -
 b/drivers/staging/lttng/README                                |    4 
 drivers/staging/lttng/ltt-events.c                            |   11 
 b/drivers/staging/lttng/probes/Makefile                       |    4 
 a/drivers/staging/lttng/probes/lttng-ftrace.c                 |  187 ----------
 drivers/staging/lttng/wrapper/ftrace.h                        |   70 ---
 b/drivers/staging/lttng/lib/ringbuffer/frontend_types.h       |    1 
 drivers/staging/lttng/wrapper/spinlock.h                      |   26 -
 b/drivers/staging/lttng/ltt-events.h                          |    3 
 drivers/staging/lttng/wrapper/uuid.h                          |   29 -
 b/kernel/sched.c                                              |    1 
 drivers/staging/lttng/lttng-context-prio.c                    |   23 -
 a/drivers/staging/lttng/wrapper/kallsyms.h                    |   30 -
 49 files changed, 44 insertions(+), 595 deletions(-)

Thanks,

Mathieu