tools/include/asm/alternative.h

File Facts

System

Linux kernel

Corpus path

tools/include/asm/alternative.h

Extension

.h

Size

353 bytes

Lines

20

Domain

Support Tooling And Documentation

Bucket

tools

Inferred role

Support Tooling And Documentation: implementation source

Status

source implementation candidate

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.

Dependency Surface

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

Detected Declarations

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

Annotated Snippet

#ifndef _TOOLS_ASM_ALTERNATIVE_ASM_H
#define _TOOLS_ASM_ALTERNATIVE_ASM_H

#if defined(__s390x__)
#ifdef __ASSEMBLY__
.macro ALTERNATIVE oldinstr, newinstr, feature
	\oldinstr
.endm
#endif
#else

/* Just disable it so we can build arch/x86/lib/memcpy_64.S for perf bench: */

#define ALTERNATIVE #

#endif

#endif

Annotation

• Atlas domain: Support Tooling And Documentation / tools.
• Implementation status: source 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.