Linux 7.3 merges AMD low power core type and unified Intel/AMD core handling

The Linux 7.3 kernel now includes a merged patch from AMD that introduces a "low power" CPU core type. This adds a third category to AMD's existing "performance" and "efficiency" cores, such as those found in Zen 4C/5C architectures. The integration also brings unified handling for CPU core types across both Intel and AMD processors.

Adopting this change requires moving to the Linux 7.3 kernel to utilize the new core type definitions and unified handling logic. For system builders and operators, this means the kernel will natively understand and schedule tasks for a broader range of heterogeneous core architectures without requiring out-of-tree patches. The cost is primarily in the validation and deployment of the new kernel version.

The new "low power" core type is presumed for some Zen 6 clients, meaning current hardware relies on the existing "performance" and "efficiency" designations. The unified handling only applies to the specific core types recognized by the kernel; any undocumented or unsupported core variants will not benefit from this integration. Systems not running Linux 7.3 or later will not recognize the new core type or the unified scheduling logic.

This development reflects a shift in processor design where hybrid architectures are becoming standard across both major x86 vendors. By unifying the core type handling, the kernel reduces the divergence between vendor-specific implementations. The addition of a "low power" tier suggests AMD is preparing for chips with even greater power savings than current efficiency cores offer.