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Add a debugfs interface, enabled by CONFIG_KAPI_SPEC_DEBUGFS, to expose
kernel API specifications at runtime. This allows tools and users to
query the complete API specifications through the debugfs filesystem.
The interface provides:
- /sys/kernel/debug/kapi/list - lists all available API specifications
- /sys/kernel/debug/kapi/specs/<name> - detailed info for each API
- /sys/kernel/debug/kapi/specs-json/<name> - the same spec as JSON
Each specification file includes:
- Function name, version, and descriptions
- Execution context requirements and flags
- Parameter details with types, flags, and constraints
- Return value specifications and success conditions
- Error codes with descriptions and conditions
- Locking requirements and constraints
- Signal handling specifications
- Examples and notes
This enables runtime introspection of kernel APIs for documentation
tools, static analyzers, and debugging purposes.
Assisted-by: LLM
Signed-off-by: Sasha Levin <sashal@kernel.org>
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