[GIT PULL] uprobes: ret-probes + misc

[Oleg Nesterov <oleg@redhat.com>]

Ingo, please pull from

  git://git.kernel.org/pub/scm/linux/kernel/git/oleg/misc uprobes/core

Mostly uretprobes. "perf probe -x file sym%return" works like kretprobes.
TODO: longjmp() is not supported, currently we assume that the probed
function returns, this needs another series.

Also the powerpc fixes plus a couple of cleanups/optimizations in uprobes
and trace_uprobes.



Ananth N Mavinakayanahalli (3):
      uprobes: Add trap variant helper
      uprobes/powerpc: Teach uprobes to ignore gdb breakpoints
      uprobes/powerpc: Remove additional trap instruction check

Anton Arapov (9):
      uretprobes: Introduce uprobe_consumer->ret_handler()
      uretprobes: Reserve the first slot in xol_vma for trampoline
      uretprobes/x86: Hijack return address
      uretprobes/powerpc: Hijack return address
      uretprobes: Return probe entry, prepare_uretprobe()
      uretprobes: Return probe exit, invoke handlers
      uretprobes: Limit the depth of return probe nestedness
      uretprobes: Remove -ENOSYS as return probes implemented
      uretprobes: Documentation update

Oleg Nesterov (18):
      uprobes: Use file_inode()
      uprobes: Turn copy_opcode() into copy_from_page()
      uprobes: Change __copy_insn() to use copy_from_page()
      uprobes: Kill the unnecesary filp != NULL check in __copy_insn()
      uprobes: Introduce copy_to_page()
      uprobes: Change write_opcode() to use copy_*page()
      uprobes/tracing: Kill the pointless task_pt_regs() calls
      uprobes/tracing: Kill the pointless seq_print_ip_sym() call
      uprobes/tracing: Kill the pointless local_save_flags/preempt_count calls
      uprobes/tracing: Generalize struct uprobe_trace_entry_head
      uprobes/tracing: Introduce uprobe_{trace,perf}_print() helpers
      uprobes/tracing: Introduce is_ret_probe() and uretprobe_dispatcher()
      uprobes/tracing: Make uprobe_{trace,perf}_print() uretprobe-friendly
      uprobes/tracing: Make register_uprobe_event() paths uretprobe-friendly
      uprobes/tracing: Make seq_printf() code uretprobe-friendly
      uprobes/tracing: Change create_trace_uprobe() to support uretprobes
      uprobes/tracing: Don't pass addr=ip to perf_trace_buf_submit()
      uprobes/perf: Avoid perf_trace_buf_prepare/submit if ->perf_events is empty

 Documentation/trace/uprobetracer.txt |  114 ++++++++------
 arch/powerpc/include/asm/uprobes.h   |    1 +
 arch/powerpc/kernel/uprobes.c        |   29 +++-
 arch/x86/include/asm/uprobes.h       |    1 +
 arch/x86/kernel/uprobes.c            |   29 ++++
 include/linux/uprobes.h              |    8 +
 kernel/events/uprobes.c              |  300 ++++++++++++++++++++++++++++------
 kernel/trace/trace.h                 |    5 -
 kernel/trace/trace_uprobe.c          |  203 +++++++++++++++++-------
 9 files changed, 526 insertions(+), 164 deletions(-)