tools/memory-model/litmus-tests/R+fencembonceonces.litmus

File Facts

System

Linux kernel

Corpus path

tools/memory-model/litmus-tests/R+fencembonceonces.litmus

Extension

.litmus

Size

499 bytes

Lines

31

Domain

Support Tooling And Documentation

Bucket

tools

Inferred role

Support Tooling And Documentation: tools

Status

atlas-only

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

• function ordered

Annotated Snippet

C R+fencembonceonces

(*
 * Result: Never
 *
 * This is the fully ordered (via smp_mb()) version of one of the classic
 * counterintuitive litmus tests that illustrates the effects of store
 * propagation delays.  Note that weakening either of the barriers would
 * cause the resulting test to be allowed.
 *)

{}

P0(int *x, int *y)
{
	WRITE_ONCE(*x, 1);
	smp_mb();
	WRITE_ONCE(*y, 1);
}

P1(int *x, int *y)
{
	int r0;

	WRITE_ONCE(*y, 2);
	smp_mb();
	r0 = READ_ONCE(*x);
}

exists (y=2 /\ 1:r0=0)

Annotation

• Detected declarations: `function ordered`.
• Atlas domain: Support Tooling And Documentation / tools.
• Implementation status: atlas-only.

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.