arch/s390/kernel/vdso/vgetrandom.c

File Facts

System

Linux kernel

Corpus path

arch/s390/kernel/vdso/vgetrandom.c

Extension

.c

Size

462 bytes

Lines

15

Domain

Architecture Layer

Bucket

arch/s390

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/facility.h
• uapi/asm-generic/errno.h
• vdso.h

Detected Declarations

• function __kernel_getrandom

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0

#include <asm/facility.h>
#include <uapi/asm-generic/errno.h>
#include "vdso.h"

ssize_t __kernel_getrandom(void *buffer, size_t len, unsigned int flags, void *opaque_state, size_t opaque_len)
{
	if (test_facility(129))
		return __cvdso_getrandom(buffer, len, flags, opaque_state, opaque_len);
	if (unlikely(opaque_len == ~0UL && !buffer && !len && !flags))
		return -ENOSYS;
	return getrandom_syscall(buffer, len, flags);
}

Annotation

• Immediate include surface: `asm/facility.h`, `uapi/asm-generic/errno.h`, `vdso.h`.
• Detected declarations: `function __kernel_getrandom`.
• Atlas domain: Architecture Layer / arch/s390.
• 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.