Re: [KGDB] Make kgdb get in sync with it's I/O drivers for the breakpoint

[Tom Rini <trini@kernel.crashing.org>]

On Tue, Apr 06, 2004 at 01:58:42PM -0700, George Anzinger wrote:

> Tom Rini wrote:
> >Hello.  The following interdiff, vs current kgdb-2 CVS makes kgdb core
> >and I/O drivers get in sync in order to cause a breakpoint.  This kills
> >off the init/main.c change, and makes way for doing things much earlier,
> >if other support exists.  What would be left, tangentally, is some sort
> >of queue to register with, so we can handle the case of KGDBOE on a
> >pcmcia card.  George? Amit? Comments ?
> 
> Well a simple but dumb way is to poll using the timer list, i.e. set up a 
> timer at the first entry were things "might" work and if the driver is not 
> yet, do a timer to come back in 1 tick, and keep doing it for each tick 
> until it is available.  This puts it all on the kgdb side.
> 
> The other way is with a call back list which would be managed by common OE 
> code. This would put most of the code in that area.  I tend to like call 
>  back lists that one registers for by passing in a structure which contains 
> a "list_head" member.  That way there is no memory allocation on either 
> end.  The manager, on a register call, just puts the new structure in its 
> call back list.  The struct would have the list_head member and a function 
> member, and the function would be called with the struct address as its 
> only parameter.  This allows for an expanded struct if more complex info is 
> needed.

Setting aside this problem for a minute (since what I posted does get
the job done, just not 100% clean), what do you think about the rest of
the changes?

-- 
Tom Rini
http://gate.crashing.org/~trini/