[PATCH]: Fix thread debugging on Sparc/Linux

[David S. Miller]

From: "David S. Miller" <davem@davemloft.net>
Date: Tue, 04 Apr 2006 16:12:16 -0700 (PDT)

> From: Daniel Jacobowitz <drow@false.org>
> Date: Tue, 4 Apr 2006 19:11:02 -0400
> 
> > On Tue, Apr 04, 2006 at 03:54:56PM -0700, David S. Miller wrote:
> > > The checkpoint/restart stuff is also non-functional on Linux/Sparc,
> > > but I think that could be due to some bug in event message handling on
> > > that platform.
> > 
> > Is gdb a 32-bit or 64-bit binary?  I bet there's problems with a
> > 32-bit binary.  At least one is that the event message is
> > stored as a long.
> 
> Yep, that's exactly where I think the bug is, in the 32-bit
> compat layer on sparc64.

I just confirmed that after fixing this in the kernel ptrace()
implementation, checkpointing works fine for 32-bit gdb running on
64-bit kernel for Linux/Sparc.