linux-kernel - Re: [PATCH 3/7] riscv: mm: Refactor create_linear_mapping

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Date:   Thu, 22 Jun 2023 06:56:04 +0200
From:   Björn Töpel <bjorn@...nel.org>
To:     Palmer Dabbelt <palmer@...belt.com>
Cc:     Paul Walmsley <paul.walmsley@...ive.com>, aou@...s.berkeley.edu,
        linux-riscv@...ts.infradead.org, Bjorn Topel <bjorn@...osinc.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org, david@...hat.com,
        osalvador@...e.de, virtualization@...ts.linux-foundation.org,
        linux@...osinc.com, alexghiti@...osinc.com
Subject: Re: [PATCH 3/7] riscv: mm: Refactor create_linear_mapping_range()
 for hot add

Palmer Dabbelt <palmer@...belt.com> writes:

> On Fri, 12 May 2023 07:57:33 PDT (-0700), bjorn@...nel.org wrote:
>> From: Björn Töpel <bjorn@...osinc.com>
>>
>> Add a parameter to the direct map setup function, so it can be used in
>> arch_add_memory() later.
>>
>> Signed-off-by: Björn Töpel <bjorn@...osinc.com>
>> ---
>>  arch/riscv/mm/init.c | 18 +++++++++---------
>>  1 file changed, 9 insertions(+), 9 deletions(-)
>>
>> diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
>> index e974ff6ef036..aea8ccb3f4ae 100644
>> --- a/arch/riscv/mm/init.c
>> +++ b/arch/riscv/mm/init.c
>> @@ -1247,18 +1247,19 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa)
>>  	pt_ops_set_fixmap();
>>  }
>>
>> -static void __init create_linear_mapping_range(phys_addr_t start,
>> -					       phys_addr_t end)
>> +static void __meminit create_linear_mapping_range(phys_addr_t start, phys_addr_t end,
>> +						  struct mhp_params *params)
>
> Sorry if I missed a v2, but it looks like this fails to build under 
> CONFIG_MEMORY_HOTPLUG=n (as struct mhp_params isn't defined) -- unless I 
> screwed up some merge conflict, but doesn't look like it here.
>
> I'm getting
>
>       CC      arch/riscv/mm/init.o
>     arch/riscv/mm/init.c:1252:58: warning: ‘struct mhp_params’ declared inside parameter list will not be visible outside of this definition or declaration
>      1252 |                                                   struct mhp_params *params)
>           |                                                          ^~~~~~~~~~
>     arch/riscv/mm/init.c: In function ‘create_linear_mapping_range’:
>     arch/riscv/mm/init.c:1261:42: error: invalid use of undefined type ‘struct mhp_params’
>      1261 |                 pgprot =  params ? params->pgprot : pgprot_from_va(va);
>           |                                          ^~
>     make[3]: *** [scripts/Makefile.build:252: arch/riscv/mm/init.o] Error 1
>     make[2]: *** [scripts/Makefile.build:494: arch/riscv/mm] Error 2
>     make[1]: *** [scripts/Makefile.build:494: arch/riscv] Error 2
>     make: *** [Makefile:2026: .] Error 2
>
> patchwork is saying something similar
> <https://gist.github.com/conor-pwbot/9ed9a564e63d824aed1786050ee06558>.

Yup! Thanks for pointing that out. This series has a bunch of more
issues, that need to be resolved in a v2.


Björn