linux-kernel - Re: [git pull] IOMMU Updates for Linux v6.16

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Message-ID: <aDqRd6Nh7iwnFvmw@8bytes.org>
Date: Sat, 31 May 2025 07:19:51 +0200
From: Joerg Roedel <joro@...tes.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Will Deacon <will@...nel.org>, linux-kernel@...r.kernel.org,
	iommu@...ts.linux.dev
Subject: Re: [git pull] IOMMU Updates for Linux v6.16

On Fri, May 30, 2025 at 09:57:34PM -0700, Linus Torvalds wrote:
> On Fri, 30 May 2025 at 05:11, Joerg Roedel <joro@...tes.org> wrote:
> >
> >           - SMMUv3:
> 
> Bah. This seems very broken.
> 
> I haven't bisected it, but my arm64 build - which I sadly didn't end
> up doing earlier today - breaks with modpost errors:
> 
>    ERROR: modpost: "arm_smmu_make_cdtable_ste"
> [drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-test.ko] undefined!
> 
> (and the same error then repeated for arm_smmu_make_s2_domain_ste /
> arm_smmu_make_s1_cd / arm_smmu_make_bypass_ste /
> arm_smmu_make_abort_ste / arm_smmu_make_sva_cd / arm_smmu_get_ste_used
> / arm_smmu_write_entry / arm_smmu_get_cd_used).

Gah, sorry for that. I didn't see it in my testing, but have seen a
similar problem related to iommufd which was fixed by removing the
iommufd part of this patch-set:

	https://lore.kernel.org/all/1926170.CQOukoFCf9@devpool92.emlix.com/

So maybe it is worth a try reverting the arm-smmu part of this series as
well:

	e436576b0231542f6f233279f0972989232575a8

Regards,

	Joerg