[Crash-utility] Fix bug of list -h

[Dave Anderson]

----- Original Message -----
> Dne Čt 7. června 2012 03:58:16 qiaonuohan napsal(a):
> > At 2012-6-6 21:44, Petr Tesarik wrote:
> > > crash>  list task_struct.tasks -s task_struct.tasks -h
> > > 0xeede04f0+432
> > > eede04f0
> > > 
> > >    tasks = {
> > >    
> > >      next = 0xd79d6f20,
> > >      prev = 0xd55e6220
> > >    
> > >    }
> > > 
> > > d79d6d70
> > > 
> > >    tasks = {
> > >    
> > >      next = 0xc32c5320,
> > >      prev = 0xeede06a0
> > >    
> > >    }
> > > 
> > > ...
> > > 
> > > Note that the first element in the list (the one which contains the
> > > starting list_head) is included.
> > > 
> > > Based on the above, I'm afraid don't quite get the intended goal of your
> > > patch.
> > 
> > Hello Petr and Dave,
> > 
> > I misunderstood the usage.
> > 
> > What I really think is changing the start address from the address of
> > list_head to the address of the structure where list_head is embedded.
> > 
> > In many cases I use list command, I found I can get the address of the
> > structure where the list_head embedded directly. And I can get the
> > offset of list_head by -o option. So the offset, say "+432" in your
> > example, can be omitted. What do you think of such change?
> 
> That was also my suggestion. It would even turn "list -h" into something
> useful. ;-)
> 
> Here's my attempt at a patch.
> 
> Petr

The tools.c changes are queued for crash-6.0.8. 

Thanks,
  Dave