arch/powerpc/kernel/dma-mask.c

File Facts

System

Linux kernel

Corpus path

arch/powerpc/kernel/dma-mask.c

Extension

.c

Size

310 bytes

Lines

14

Domain

Architecture Layer

Bucket

arch/powerpc

Inferred role

Architecture Layer: exported/initcall integration point

Status

integration implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

• CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.
• Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/dma-mapping.h
• linux/dma-map-ops.h
• linux/export.h
• asm/machdep.h

Detected Declarations

• function arch_dma_set_mask
• export arch_dma_set_mask

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0

#include <linux/dma-mapping.h>
#include <linux/dma-map-ops.h>
#include <linux/export.h>
#include <asm/machdep.h>

void arch_dma_set_mask(struct device *dev, u64 dma_mask)
{
	if (ppc_md.dma_set_mask)
		ppc_md.dma_set_mask(dev, dma_mask);
}
EXPORT_SYMBOL(arch_dma_set_mask);

Annotation

• Immediate include surface: `linux/dma-mapping.h`, `linux/dma-map-ops.h`, `linux/export.h`, `asm/machdep.h`.
• Detected declarations: `function arch_dma_set_mask`, `export arch_dma_set_mask`.
• Atlas domain: Architecture Layer / arch/powerpc.
• Implementation status: integration implementation candidate.

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.