tools/memory-model/litmus-tests/SB+rfionceonce-poonceonces.litmus

File Facts

System

Linux kernel

Corpus path

tools/memory-model/litmus-tests/SB+rfionceonce-poonceonces.litmus

Extension

.litmus

Size

452 bytes

Lines

33

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

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

Annotated Snippet

C SB+rfionceonce-poonceonces

(*
 * Result: Sometimes
 *
 * This litmus test demonstrates that LKMM is not fully multicopy atomic.
 *)

{}

P0(int *x, int *y)
{
	int r1;
	int r2;

	WRITE_ONCE(*x, 1);
	r1 = READ_ONCE(*x);
	r2 = READ_ONCE(*y);
}

P1(int *x, int *y)
{
	int r3;
	int r4;

	WRITE_ONCE(*y, 1);
	r3 = READ_ONCE(*y);
	r4 = READ_ONCE(*x);
}

locations [0:r1; 1:r3; x; y] (* Debug aid: Print things not in "exists". *)
exists (0:r2=0 /\ 1:r4=0)

Annotation

• 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.