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    Subject[RFC PATCH v3 0/6] uprobes: return probe implementation

    RFC v3 uretprobes implementation. I'd be grateful for review.

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

    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 | 6 +++
    kernel/events/uprobes.c | 112 ++++++++++++++++++++++++++++++++++++++---
    4 files changed, 146 insertions(+), 7 deletions(-)


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