ptrace single-stepping change breaks Wine

[Linus Torvalds]

On Wed, 29 Dec 2004, Linus Torvalds wrote:
> 
> .. no, I see what's up. System call returns _are_ special for 
> single-stepping. I'll think about it..

Ok, I think I know what's up.

It's literally the bogus fake signal that do_syscall_trace() sends. I 
think the TIF_SINGLESTEP case in do_syscall_trace() should only do the 
ptrace_notify() and return..

		Linus