arch/arm/mm/cache-nop.S

File Facts

System

Linux kernel

Corpus path

arch/arm/mm/cache-nop.S

Extension

.S

Size

1222 bytes

Lines

53

Domain

Architecture Layer

Bucket

arch/arm

Inferred role

Architecture Layer: arch/arm

Status

atlas-only

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.
• Touches IRQ or DMA behavior; this matters for the representative real-device path.

Dependency Surface

• linux/linkage.h
• linux/init.h
• linux/cfi_types.h
• asm/assembler.h
• proc-macros.S

Detected Declarations

• No top-level syscall, struct, function, initcall, or export declaration detected by the generator.

Annotated Snippet

#include <linux/linkage.h>
#include <linux/init.h>
#include <linux/cfi_types.h>
#include <asm/assembler.h>

#include "proc-macros.S"

/*
 * These are all open-coded instead of aliased, to make clear
 * what is going on here: all functions are stubbed out.
 */
SYM_TYPED_FUNC_START(nop_flush_icache_all)
	ret	lr
SYM_FUNC_END(nop_flush_icache_all)

SYM_TYPED_FUNC_START(nop_flush_kern_cache_all)
	ret	lr
SYM_FUNC_END(nop_flush_kern_cache_all)

SYM_TYPED_FUNC_START(nop_flush_user_cache_all)
	ret	lr
SYM_FUNC_END(nop_flush_user_cache_all)

SYM_TYPED_FUNC_START(nop_flush_user_cache_range)
	ret	lr
SYM_FUNC_END(nop_flush_user_cache_range)

SYM_TYPED_FUNC_START(nop_coherent_kern_range)
	ret	lr
SYM_FUNC_END(nop_coherent_kern_range)

SYM_TYPED_FUNC_START(nop_coherent_user_range)
	mov	r0, 0
	ret	lr
SYM_FUNC_END(nop_coherent_user_range)

SYM_TYPED_FUNC_START(nop_flush_kern_dcache_area)
	ret	lr
SYM_FUNC_END(nop_flush_kern_dcache_area)

SYM_TYPED_FUNC_START(nop_dma_flush_range)
	ret	lr
SYM_FUNC_END(nop_dma_flush_range)

SYM_TYPED_FUNC_START(nop_dma_map_area)
	ret	lr
SYM_FUNC_END(nop_dma_map_area)

SYM_TYPED_FUNC_START(nop_dma_unmap_area)
	ret	lr
SYM_FUNC_END(nop_dma_unmap_area)

Annotation

• Immediate include surface: `linux/linkage.h`, `linux/init.h`, `linux/cfi_types.h`, `asm/assembler.h`, `proc-macros.S`.
• Atlas domain: Architecture Layer / arch/arm.
• Implementation status: atlas-only.
• IRQ or DMA behavior appears here, which is relevant to the selected PCIe/NVMe device path.

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.