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Date:   Tue, 02 Feb 2021 18:35:00 -0800 (PST)
From:   Palmer Dabbelt <palmer@...belt.com>
To:     atishp@...shpatra.org
CC:     geert@...ux-m68k.org, rdunlap@...radead.org,
        linux-riscv@...ts.infradead.org, aou@...s.berkeley.edu,
        linux-kernel@...r.kernel.org,
        Paul Walmsley <paul.walmsley@...ive.com>
Subject:     Re: Kconfig-induced build errors: CONFIG_PAGE_OFFSET

On Tue, 02 Feb 2021 18:27:42 PST (-0800), Palmer Dabbelt wrote:
> On Fri, 29 Jan 2021 05:52:51 PST (-0800), geert@...ux-m68k.org wrote:
>> Hi Atish,
>>
>> On Thu, Jan 28, 2021 at 9:09 PM Atish Patra <atishp@...shpatra.org> wrote:
>>> On Wed, Jan 27, 2021 at 7:18 PM Randy Dunlap <rdunlap@...radead.org> wrote:
>>> > I took a riscv-32 .config from kernel test robot (it was for a clang build)
>>> > and did a "make olddefconfig" (using gcc tools) and got build errors
>>> > due to this config item from arch/riscv/Kconfig;
>>> >
>>> >
>>> > config PAGE_OFFSET
>>> >         hex
>>> >         default 0xC0000000 if 32BIT && MAXPHYSMEM_1GB
>>> >         default 0x80000000 if 64BIT && !MMU
>>> >         default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB
>>> >         default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB
>>> >
>>> > PAGE_OFFSET is undefined for the case of 32BIT && MAXPHYSMEM_2GB.
>>>
>>> Because, RV32 doesn't support 2GB physical memory yet.
>>>
>>> The compilation errors can be fixed by not allowing MAXPHYSMEM_2GB for RV32 and
>>> MAXPHYSMEM_1GB for RV64. How about this ?
>>>
>>> --- a/arch/riscv/Kconfig
>>> +++ b/arch/riscv/Kconfig
>>> @@ -253,8 +253,10 @@ choice
>>>         default MAXPHYSMEM_128GB if 64BIT && CMODEL_MEDANY
>>>
>>>         config MAXPHYSMEM_1GB
>>> +               depends on 32BIT
>>>                 bool "1GiB"
>>>         config MAXPHYSMEM_2GB
>>> +               depends on 64BIT && CMODEL_MEDLOW
>>>                 bool "2GiB"
>>>         config MAXPHYSMEM_128GB
>>>                 depends on 64BIT && CMODEL_MEDANY
>>
>> Thanks, works fine on litex-vexriscv.
>> Tested-by: Geert Uytterhoeven <geert@...ux-m68k.org>
>
> Atish: did I miss an actual patch?  I just see diff here.

Never mind, I found it.  Thanks!

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