Re: [PATCH for 4.5] xen/arm: p2m: Correctly initialize cur_offset

[Ian Campbell <Ian.Campbell@citrix.com>]

On Wed, 2014-10-01 at 16:00 +0100, Julien Grall wrote:
> On 10/01/2014 11:33 AM, Ian Campbell wrote:
> > On Tue, 2014-09-30 at 15:51 +0100, Julien Grall wrote:
> >> {~0,} only initializes the first cell of the array to ~0. The other cells
> >> are initialized to 0.
> >>
> >> Change the initialization to a loop and, at the same time, do the same
> >> for the mappings.
> > 
> > I'm not sure a loop is the best option here vs either { ~0, ~0, ~0, ~0 }
> > or a memset, but OK.
> 
> Thinking a bit more, we effectively need to initialize only the first 2
> cells. It's because the P2M can start either at level 0 or level 1.
> 
> Anyway I will use { ~0, ~0, ~0, ~0 }.
> 
> > I don't think mappings is wrong as it is though, any reason to change?
> 
> { NULL, } initialize the first cell to NULL and the other to 0.
> 
> As NULL is equal to (void *)0 it's fine, but I would prefer if we can
> get a rid of this construction.
> 
> I would prefer if we do { NULL, NULL, NULL, NULL }.

OK.

> 
> >> This is fixing boot after 82985d7 "xen: arm: handle variable p2m levels
> >> in apply_p2m_changes" on platform where the root-level doesn't have
> >> concatenate table (such as the Foundation Model).
> > 
> > You forgot your S-o-b.
> 
> Oh right. I will resend a patch
> 
> 
>