Re: [Xen-devel] [PATCH v3 09/25] xen/arm: introduce bootcmdlines

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Thu, 4 Oct 2018, Julien Grall wrote:
> Hi Stefano,
> 
> On 04/10/2018 00:11, Stefano Stabellini wrote:
> > On Wed, 1 Aug 2018, Julien Grall wrote:
> > > > +    {
> > > > +        mod = &mods->cmdline[i];
> > > > +        if ( mod->kind == kind )
> > > > +            return mod;
> > > > +    }
> > > > +    return NULL;
> > > > +}
> > > > +
> > > >    const char * __init boot_module_kind_as_string(bootmodule_kind kind)
> > > >    {
> > > >        switch ( kind )
> > > > @@ -723,7 +732,7 @@ void __init start_xen(unsigned long
> > > > boot_phys_offset,
> > > >        /* Register Xen's load address as a boot module. */
> > > >        xen_bootmodule = add_boot_module(BOOTMOD_XEN,
> > > >                                 (paddr_t)(uintptr_t)(_start +
> > > > boot_phys_offset),
> > > > -                             (paddr_t)(uintptr_t)(_end - _start + 1),
> > > > NULL);
> > > > +                             (paddr_t)(uintptr_t)(_end - _start + 1));
> > > >        BUG_ON(!xen_bootmodule);
> > > >          xen_paddr = get_xen_paddr();
> > > > diff --git a/xen/include/asm-arm/setup.h b/xen/include/asm-arm/setup.h
> > > > index f1e4a3f..cb7da51 100644
> > > > --- a/xen/include/asm-arm/setup.h
> > > > +++ b/xen/include/asm-arm/setup.h
> > > > @@ -35,6 +35,12 @@ struct bootmodule {
> > > >        bootmodule_kind kind;
> > > >        paddr_t start;
> > > >        paddr_t size;
> > > > +};
> > > > +
> > > > +#define DT_MAX_NAME 32
> > > 
> > > It might be useful to explain where 32 comes from.
> > 
> > The limit is somewhat arbitrary. I'll explain in a comment.
> 
> Is it? I thought you got it from the specification (2.2.1 in [1]):
> 
> "Each node in the devicetree is named according to the following convention:
> 
> node-name@unit-address
> 
> The node-name component specifies the name of the node. It shall be 1 to 31
> characters in length and consist solely of characters from the set of
> characters in Table 2.1.
> "
> 
> As the number does not take into account the unit-address, I would bump to 41
> characters (8 digit for unit-address should be sufficient and 1 for @).

Will do, thanks for looking up the spec, I forgot about it


> Cheers,
> 
> [1]
> https://github.com/devicetree-org/devicetree-specification/releases/tag/v0.2

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