Differential D54502

linuxkpi: Add `radix_tree_deref_slot()`
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Authored by dumbbell on Jan 4 2026, 10:31 AM.

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linuxkpi

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rG4c89b333808a: linuxkpi: Add `radix_tree_deref_slot()`

Summary

We don't do reference counting, therefore this is a no-op.

The amdgpu DRM driver started to use it in Linux 6.10.

This is part of the update of DRM drivers to Linux 6.10.

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rG FreeBSD src repository

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dumbbell created this revision.Jan 4 2026, 10:31 AM

Herald added subscribers: emaste, imp. · View Herald TranscriptJan 4 2026, 10:31 AM

dumbbell requested review of this revision.Jan 4 2026, 10:31 AM

Technically this is not a no-op as you do a *-operation.

Looking at radix_tree_lookup() it seems we also do not provide pointer stability, so this should be fine within our implementation at least.

This revision is now accepted and ready to land.Jan 4 2026, 9:48 PM

Closed by commit rG4c89b333808a: linuxkpi: Add `radix_tree_deref_slot()` (authored by dumbbell). · Explain WhyJan 5 2026, 8:10 PM

This revision was automatically updated to reflect the committed changes.

dumbbell added a commit: rG4c89b333808a: linuxkpi: Add `radix_tree_deref_slot()`.

In D54502#1245389, @bz wrote:

Technically this is not a no-op as you do a *-operation.

Good catch, I modified the commit message.

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sys/

compat/

linuxkpi/

common/

include/

linux/

radix-tree.h

6 lines

Diff 169118

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sys/compat/linuxkpi/common/include/linux/radix-tree.h

linuxkpi: Add `radix_tree_deref_slot()`ClosedPublicActions