Claude review: drm: uapi: Add macro for chipset specific event ID region

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Overall Series Review

Subject: drm: uapi: Add macro for chipset specific event ID region
Author: Bence Csokas <bence.csokas@arm.com>
Patches: 1
Reviewed: 2026-04-12T12:13:17.431218

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This is a single patch that introduces a `DRM_EVENT_VENDOR_SPECIFIC(_v)` macro to codify the existing convention that DRM event types `>= 0x80000000` are reserved for chipset/driver-specific use. The concept is sound — elevating a comment-only contract into a code-enforced convention is good practice for UAPI headers.

However, the patch has one notable omission: `nouveau_drm.h` defines `DRM_NOUVEAU_EVENT_NVIF` as `0x80000000` (line 28) but was not converted. This appears to be because in `nouveau_drm.h` the define appears *before* the `#include "drm.h"` (line 30), so the macro wouldn't be available at the point of use. This is a valid technical obstacle, but it should be explicitly called out in the commit message. Silently skipping one of the four vendor-specific event definitions without explanation undermines the goal of making the conversion comprehensive.

The macro values are all numerically correct — every converted definition produces the same value as before.

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