linux-kernel - Re: [PATCH v2] of/fdt: Don't worry about non-memory region overlap for no-map

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Date:   Wed, 15 Dec 2021 11:24:02 -0800
From:   Stephen Boyd <swboyd@...omium.org>
To:     Mike Rapoport <rppt@...nel.org>
Cc:     Rob Herring <robh+dt@...nel.org>, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org,
        Douglas Anderson <dianders@...omium.org>,
        Nicolas Boichat <drinkcat@...omium.org>,
        Quentin Perret <qperret@...gle.com>,
        Jan Kiszka <jan.kiszka@...mens.com>
Subject: Re: [PATCH v2] of/fdt: Don't worry about non-memory region overlap
 for no-map

Quoting Mike Rapoport (2021-12-15 02:01:59)
> On Wed, Dec 15, 2021 at 11:49:37AM +0200, Mike Rapoport wrote:
> >
> > On Tue, Dec 14, 2021 at 11:20:11PM -0800, Stephen Boyd wrote:
> > > @@ -482,9 +482,11 @@ static int __init early_init_dt_reserve_memory_arch(phys_addr_t base,
> > >     if (nomap) {
> > >             /*
> > >              * If the memory is already reserved (by another region), we
> > > -            * should not allow it to be marked nomap.
> > > +            * should not allow it to be marked nomap, but don't worry
> > > +            * if the region isn't memory as it won't be mapped.
> > >              */
> > > -           if (memblock_is_region_reserved(base, size))
> > > +           if (memblock_overlaps_region(&memblock.memory, base, size) &&
> > > +               memblock_is_region_reserved(base, size))
>
> One more small thing. Maybe add pr_warn() here?
>

There's already a print in __reserved_mem_reserve_reg() when this
function returns an error so it doesn't seem very useful to add another
print.