[GIT PULL] uprobes: pre-filtering

[Oleg Nesterov <oleg@redhat.com>]

Ingo, please pull from

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

Mostly pre-filtering. This needs more work and perhaps more functionality.
In particular, perhaps dup_mmap() should remove the unwanted breakpoints.
And we can add more ->filter() hooks to, say, speedup uprobe_register().
Plus we can do some optimizations to avoid register_for_each_vma() in
case when we know that all mm's were previously acked/nacked.

Srikar, the only patch you did not ack explicitely is 1fecb96d
"Do not allocate current->utask unnecessary", but afaics you do not
object.

And the patch from Josh which exports uprobe_register/unregister for modules.
Christoph (cc'ed) doesn't like this change, but I disagree. Whatever you
think about systemtap it is the widely used tool, and uprobes can have other
out-of-tree users. This is like kprobes, kprobe_register() is exported but
it doesn't have a modular in-kernel user too. I do not see why should we
limit the usage of uprobes.



Josh Stone (1):
      uprobes: Add exports for module use

Oleg Nesterov (26):
      uprobes: Move __set_bit(UPROBE_SKIP_SSTEP) into alloc_uprobe()
      uprobes: Kill the "uprobe != NULL" check in uprobe_unregister()
      uprobes: Kill the pointless inode/uc checks in register/unregister
      uprobes: Kill uprobe_consumer->filter()
      uprobes: Introduce filter_chain()
      uprobes: _unregister() should always do register_for_each_vma(false)
      uprobes: _register() should always do register_for_each_vma(true)
      uprobes: Introduce uprobe->register_rwsem
      uprobes: Change filter_chain() to iterate ->consumers list
      uprobes: Kill UPROBE_RUN_HANDLER flag
      uprobes: Kill uprobe->copy_mutex
      uprobes: Kill uprobe_events, use RB_EMPTY_ROOT() instead
      uprobes: Introduce uprobe_is_active()
      uprobes: Kill uprobes_mutex[], separate alloc_uprobe() and __uprobe_register()
      uprobes: Rationalize the usage of filter_chain()
      uprobes: Reintroduce uprobe_consumer->filter()
      uprobes: Teach handler_chain() to filter out the probed task
      uprobes/x86: Change __skip_sstep() to actually skip the whole insn
      uprobes: Change handle_swbp() to expose bp_vaddr to handler_chain()
      uprobes: Move alloc_page() from xol_add_vma() to xol_alloc_area()
      uprobes: Fold xol_alloc_area() into get_xol_area()
      uprobes: Turn add_utask() into get_utask()
      uprobes: Do not play with utask in xol_get_insn_slot()
      uprobes: Fix utask->xol_vaddr leak in pre_ssout()
      uprobes: Do not allocate current->utask unnecessary
      uprobes: Kill the bogus IS_ERR_VALUE(xol_vaddr) check

 arch/x86/kernel/uprobes.c   |    4 +-
 include/linux/uprobes.h     |   17 ++-
 kernel/events/uprobes.c     |  433 ++++++++++++++++++++++---------------------
 kernel/ptrace.c             |    6 +
 kernel/trace/trace_uprobe.c |    5 +-
 5 files changed, 243 insertions(+), 222 deletions(-)