[RFC PATCH]djprobe: new patch for the latest kprobes

[Masami Hiramatsu]

Hi,

Here is a new djprobe patch that includes some changes.

Changes:
- On UP kernel, djprobe changes code directly to jump code.
- Change kprobe's get/free_inst_slot and use it to allocate djprobe stub 
code.
- Port sync_core() from x86-64 and use it instead of flush_icache_all().
- Remove CONFIG_DJPROBES and define ARCH_SUPPORTS_DJPROBES.(like kretprobes)
- register_djprobe and register_kprobe return -EBUSY when specified 
address is already used by each other. (This is a temporary implementation.)

TODO:
- Support multiple djprobes insertion on an address.
- Support multiple kprobes and djprobes insertion on an address.

I think the best way to solve confliction of djprobes and kprobes is to 
get together those probes as a kprobe. Because djprobes can not handle 
any fault handlers.

This patch againsts 2.6.13-rc5-mm1.

I will post the djprobe patch to LKML after it is reviewed.

BTW, I marry tomorrow and leave in today for my honeymoon, and come back 
5 Sep. So, I'm sorry that I will not reply until 5 Sep.

-- 
Masami HIRAMATSU
2nd Research Dept.
Hitachi, Ltd., Systems Development Laboratory
E-mail: hiramatu@sdl.hitachi.co.jp

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