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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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