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

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Message-ID: <CAHk-=wh4qRwm7AQ8sBmQj7qECzgAhj4r73RtCDfmHo5SdcN0Jw@mail.gmail.com>
Date: Fri, 30 May 2025 22:20:02 -0700
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Joerg Roedel <joro@...tes.org>, Rolf Eike Beer <eb@...ix.com>, Lu Baolu <baolu.lu@...ux.intel.com>
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, 30 May 2025 at 21:57, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> 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!

Ok, bisected to commit e436576b0231 ("iommu: make inclusion of
arm/arm-smmu-v3 directory conditional").

Which explains why I didn't see any obvious code changes that would
explain that.

This is with a plain "make allmodconfig" build, and I think the issue
is that CONFIG_ARM_SMMU_V3 is 'm', not 'y', and the change didn't take
that modular case into account at all.

I'll revert it, but I'll wait until tomorrow to see if somebody has an
alternative fix.

            Linus