[Patch 0/2 v2] Improvements for hw_breakpoint_handler()

[K.Prasad]

Hi Frederic,
        Can you please pull the second version of the patch which perform
the  following.

Patch 1/2: Clears the arch-reserved bits from debug status register. This
helps easy bitwise operations - such as the check for non-trap bits in
hw_breakpoint_handler. A check for the same using
"if (dr6 & (~DR_TRAP_BITS))" throws incorrect results due to the
presence of preset reserved bits.

Patch 2/2: Return NOTIFY_DONE from hw_breakpoint_handler() for interested
user-space breakpoints (and not unconditionally) since this could lead to
further processing in do_debug() with undesirable consequences.

Changelog ver II
----------------
Version I: LKML ref: 20091226182519.GA9494@xxxxxxxxxx

- Return NOTIFY_DONE for further processing (i.e. signal delivery) only for
  interested user-space breakpoints i.e. with current->thread.debugreg6 bits
  set.

Thanks,
K.Prasad

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