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    Subject[RFC PATCH v4 0/6] uprobes: return probe implementation

    RFC v4 uretprobes implementation. I'd be grateful for review.
    /* Oleg, this one is more quirky than previous, don't beat me. */

    These patches extending uprobes by enabling tools, such as perf(trace_event),
    set a breakpoint on probed function's return address.

    - get rid of area->rp_trampoline_vaddr as it always the same as ->vaddr
    - preallocate slot, as the first one in xol_add_vma()
    - cleanup ->return_uprobes list in uprobe_free_utask(), because the
    task can exit from inside the ret-probe'd function(s).
    - in find_active_uprobe(): Once we inserted "int3" we must ensure that
    handle_swbp() will be called even if this uprobe goes away. We have
    the reference but it only protects uprobe itself, it can't protect
    agains delete_uprobe().
    IOW, we must ensure that uprobe_pre_sstep_notifier() can't return 0.
    - check, whether utask is not NULL in handle_uretprobe()
    ? do we want a printk() for this case?
    - minor handle_uretprobe() fixups

    v3 changes:
    - removed uretprobe_bypass logic, it will be better to send it as
    independent patch
    - unified xol_get_trampoline_slot() and xol_get_insn_slot()
    - protected uprobe with refcounter in prepare_uretprobe()
    - uprobe_register() routine fails now, if neither consumer is set
    - enclosed implementation into 1/6, 6/6 patches -ENOSYS bits

    v2 changes:
    - introduced rp_handler(), get rid of return_consumers
    - get rid of uretprobe_[un]register()
    - introduced arch_uretprobe_get_sp()
    - removed uprobe_task->doomed, kill task immediately
    - fix arch_uretprobe_hijack_return_addr()'s returns
    - address the v1 minor issues

    integrated patchset:

    previous implementations:


    Anton Arapov (6):
    uretprobes: preparation patch
    uretprobes/x86: hijack return address
    uretprobes: generalize xol_get_insn_slot()
    uretprobes: return probe entry, prepare uretprobe
    uretprobes: invoke return probe handlers
    uretprobes: implemented, thus remove -ENOSYS

    arch/x86/include/asm/uprobes.h | 6 ++
    arch/x86/kernel/uprobes.c | 29 +++++++++
    include/linux/uprobes.h | 5 ++
    kernel/events/uprobes.c | 134 ++++++++++++++++++++++++++++++++++++++---
    4 files changed, 166 insertions(+), 8 deletions(-)


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