history of one ia64 kprobes patch

[Frank Ch. Eigler]

I wrote:

> Once upon a time, about two years ago, a patch went into the kernel
> for rejecting some kprobes placements in ia64.[...]  This test is in
> RHEL5 (inherited from 2.6.18), but does not appear in the current
> git tree, and I can't seem to find when/why it came back out. [...]

Never mind.  Of course, git knows the answer:

Commit: 08ed38b68099f2a492196414b08a7f5dd8dc3537 
Author: Tony Luck <tony.luck@intel.com> Tue, 14 Nov 2006 09:33:38 -0800 

    [IA64] enable trap code on slot 1
    
    Because slot 1 of one instr bundle crosses border of two consecutive
    8-bytes, kprobe on slot 1 is disabled. This patch enables kprobe on
    slot1, it only replaces higher 8-bytes of the instruction bundle and
    changes the exception code to ignore the low 12 bits of the break
    number (which is across the border in the lower 8-bytes of the bundle).
    
    For those instructions which must execute regardless qp bits,
    kprobe on slot 1 is still disabled.
    
    Signed-off-by: bibo,mao <bibo.mao@intel.com>
    Signed-off-by: Tony Luck <tony.luck@intel.com>

- FChE