Re: [Xen-devel] [PATCH for-4.13] xen/arm: fix duplicate memory node in DT

[Stefano Stabellini <sstabellini@kernel.org>]

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On Mon, 7 Oct 2019, Jürgen Groß wrote:
> On 05.10.19 01:09, Stefano Stabellini wrote:
> > When reserved-memory regions are present in the host device tree, dom0
> > is started with multiple memory nodes. Each memory node should have a
> > unique name, but today they are all called "memory" leading to Linux
> > printing the following warning at boot:
> > 
> >    OF: Duplicate name in base, renamed to "memory#1"
> > 
> > This patch fixes the problem by appending a "@<unit-address>" to the
> > name, as per the Device Tree specification, where <unit-address> matches
> > the base of address of the first region.
> > 
> > Reported-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
> > Signed-off-by: Stefano Stabellini <stefano.stabellini@xilinx.com>
> > 
> > ---
> > 
> > diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
> > index 921b054520..a4c07db383 100644
> > --- a/xen/arch/arm/domain_build.c
> > +++ b/xen/arch/arm/domain_build.c
> > @@ -646,16 +646,22 @@ static int __init make_memory_node(const struct domain
> > *d,
> >       int res, i;
> >       int reg_size = addrcells + sizecells;
> >       int nr_cells = reg_size * mem->nr_banks;
> > +    /* Placeholder for memory@ + a 32-bit number + \0 */
> > +    char buf[18];
> 
> You are using PRIx64 for printing the number, so I guess you should
> enlarge buf by 8 bytes and adjust the comment (s/32/64/).

Well spotted! In fact, there is a similar error in make_cpus_node. I'll
fix that one too in a separate patch.


> >       __be32 reg[NR_MEM_BANKS * 4 /* Worst case addrcells + sizecells */];
> >       __be32 *cells;
> >         BUG_ON(nr_cells >= ARRAY_SIZE(reg));
> > +    /* Nothing to do */
> > +    if ( mem->nr_banks == 0 )
> > +        return 0;
> >         dt_dprintk("Create memory node (reg size %d, nr cells %d)\n",
> >                  reg_size, nr_cells);
> >         /* ePAPR 3.4 */
> > -    res = fdt_begin_node(fdt, "memory");
> > +    snprintf(buf, sizeof(buf), "memory@%"PRIx64, mem->bank[0].start);
> > +    res = fdt_begin_node(fdt, buf);
> >       if ( res )
> >           return res;
> 
> 
> Juergen
> 

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