linux-kernel - Re: Kconfig-induced build errors: CONFIG_PAGE

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Date:   Thu, 28 Jan 2021 12:40:42 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Atish Patra <atishp@...shpatra.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        Albert Ou <aou@...s.berkeley.edu>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>
Subject: Re: Kconfig-induced build errors: CONFIG_PAGE_OFFSET

On 1/28/21 12:07 PM, Atish Patra wrote:
> On Wed, Jan 27, 2021 at 7:18 PM Randy Dunlap <rdunlap@...radead.org> wrote:
>>
>> Hi,
>>
>> 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
Looks good. Thanks.

Acked-by: Randy Dunlap <rdunlap@...radead.org>

-- 
~Randy