arch/xtensa/include/asm/ftrace.h

File Facts

System

Linux kernel

Corpus path

arch/xtensa/include/asm/ftrace.h

Extension

.h

Size

764 bytes

Lines

32

Domain

Architecture Layer

Bucket

arch/xtensa

Inferred role

Architecture Layer: implementation source

Status

source 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.

Dependency Surface

• asm/processor.h

Detected Declarations

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

Annotated Snippet

#ifndef _XTENSA_FTRACE_H
#define _XTENSA_FTRACE_H

#include <asm/processor.h>

#ifndef __ASSEMBLER__
extern unsigned long return_address(unsigned level);
#define ftrace_return_address(n) return_address(n)
#endif /* __ASSEMBLER__ */

#ifdef CONFIG_FUNCTION_TRACER

#define MCOUNT_ADDR ((unsigned long)(_mcount))
#define MCOUNT_INSN_SIZE 3

#ifndef __ASSEMBLER__
extern void _mcount(void);
#define mcount _mcount
#endif /* __ASSEMBLER__ */
#endif /* CONFIG_FUNCTION_TRACER */

#endif /* _XTENSA_FTRACE_H */

Annotation

• Immediate include surface: `asm/processor.h`.
• Atlas domain: Architecture Layer / arch/xtensa.
• 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.