Re: interesting line in process.c

On Sat, Oct 13, 2001 at 09:56:32PM +1000, Paul Mackerras wrote:

I'm intrigued by this line, line 276 in arch/ppc/kernel/process.c in
linuxppc_2_4_devel:

#if defined(CONFIG_4xx) && defined(DCRN_PLB0_BEAR) && defined(DCRN_PLB0_BEAR)

When could we have DCRN_PLB0_BEAR defined but DCRN_PLB0_BEAR not? :)
Could it ever be defined if CONFIG_4xx was not defined?

Which brings up another question that I have been meaning to ask: what
is the rationale for adding the dbcr0/1 fields to the ptrace struct
for 4xx?

Since struct ptrace is part of the kernel/user ABI, I prefer not to
change it unless it is absolutely necessary.  Could the dbcr0/1 fields
go in the thread_struct instead?  Where and how are they used?

Well, I don't know anything about the 4xx, so this might not be
reasonable - but could they be used in setting hardware breakpoints?

--
Daniel Jacobowitz                           Carnegie Mellon University
MontaVista Software                         Debian GNU/Linux Developer

** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/