[PATCH] [POWERPC] Make Book-E debug handling SMP safe

[Kumar Gala]

On Apr 14, 2008, at 11:44 PM, Paul Mackerras wrote:
> Kumar Gala writes:
>
>> global_dbcr0 needs to be a per cpu set of save areas instead of a  
>> single
>> global on all processors.
>
> Looks reasonable.  At some point you might want to use a per-cpu
> variable instead of an array in order to reduce cacheline bouncing.

Can you point me at an example of this.  Do we do any asm access with  
per-cpu variables anywhere today?

>> Also, we switch to using DBCR0_IDM to determine if the user space  
>> app is
>> being debugged as its a more consistent way.  In the future we should
>> support features like hardware breakpoint and watchpoints which will
>> have DBCR0_IDM set but not necessarily DBCR0_IC (single step).
>
> That should be OK.

Ok.  I'll put it my powerpc-next tree.

- k