linux-kernel - Re: [PATCH] iommu: PGTABLE

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Message-ID: <833203b0-aee5-eb23-afb4-ff71a3024258@infradead.org>
Date:   Thu, 30 Mar 2023 09:49:12 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Robin Murphy <robin.murphy@....com>, linux-kernel@...r.kernel.org
Cc:     Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        iommu@...ts.linux.dev, Conor Dooley <conor@...nel.org>,
        linux-riscv@...ts.infradead.org
Subject: Re: [PATCH] iommu: PGTABLE_LPAE is also for RISCV



On 3/30/23 09:34, Robin Murphy wrote:
> On 2023-03-30 07:01, Randy Dunlap wrote:
>> On riscv64, linux-next-20233030 (and for several days earlier),
>> there is a kconfig warning:
>>
>> WARNING: unmet direct dependencies detected for IOMMU_IO_PGTABLE_LPAE
>>    Depends on [n]: IOMMU_SUPPORT [=y] && (ARM || ARM64 || COMPILE_TEST [=n]) && !GENERIC_ATOMIC64 [=n]
>>    Selected by [y]:
>>    - IPMMU_VMSA [=y] && IOMMU_SUPPORT [=y] && (ARCH_RENESAS [=y] || COMPILE_TEST [=n]) && !GENERIC_ATOMIC64 [=n]
>>
>> and build errors:
>>
>> riscv64-linux-ld: drivers/iommu/io-pgtable-arm.o: in function `.L140':
>> io-pgtable-arm.c:(.init.text+0x1e8): undefined reference to `alloc_io_pgtable_ops'
>> riscv64-linux-ld: drivers/iommu/io-pgtable-arm.o: in function `.L168':
>> io-pgtable-arm.c:(.init.text+0xab0): undefined reference to `free_io_pgtable_ops'
>> riscv64-linux-ld: drivers/iommu/ipmmu-vmsa.o: in function `.L140':
>> ipmmu-vmsa.c:(.text+0xbc4): undefined reference to `free_io_pgtable_ops'
>> riscv64-linux-ld: drivers/iommu/ipmmu-vmsa.o: in function `.L0 ':
>> ipmmu-vmsa.c:(.text+0x145e): undefined reference to `alloc_io_pgtable_ops'
>>
>> Add RISCV as an allowed ARCH dependency to fix these problems.
>>
>> Fixes: d286a58bc8f4 ("iommu: Tidy up io-pgtable dependencies")
> 
> BTW that doesn't look like the right fix target - this presumably dates back as far as when ARCH_RENESAS was added to RISCV, such that it was possible to start selecting IPMMU_VMSA without COMPILE_TEST?

OK, I can go with that. Thanks for your help.

-- 
~Randy