Documentation/driver-api/cxl/linux/early-boot.rst

File Facts

System

Linux kernel

Corpus path

Documentation/driver-api/cxl/linux/early-boot.rst

Extension

.rst

Size

5584 bytes

Lines

138

Domain

Support Tooling And Documentation

Bucket

Documentation

Inferred role

Support Tooling And Documentation: documentation

Status

atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

• Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• No C-style include directives detected by the generator.

Detected Declarations

• function Init

Annotated Snippet

void __init hugetlb_cma_reserve(void) {
    if (!node_online(nid))
      /* do not allow reservations */
  }

This means if users intend to defer management of CXL memory to the driver, CMA
cannot be used to guarantee huge page allocations.  If enabling CXL memory as
SystemRAM in `ZONE_NORMAL` during early boot, CMA reservations per-node can be
made with the :code:`cma_pernuma` or :code:`numa_cma` kernel command line
parameters.

Annotation

• Detected declarations: `function Init`.
• Atlas domain: Support Tooling And Documentation / Documentation.
• Implementation status: atlas-only.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.