lib/crypto/mpi/mpi-sub-ui.c

File Facts

System

Linux kernel

Corpus path

lib/crypto/mpi/mpi-sub-ui.c

Extension

.c

Size

2349 bytes

Lines

81

Domain

Kernel Services

Bucket

lib

Inferred role

Kernel Services: exported/initcall integration point

Status

integration implementation candidate

Why This File Exists

Shared kernel service surface used by multiple subsystems, including helpers, cryptography, virtualization support, and async I/O infrastructure.

• Shared kernel service surface used by multiple subsystems, including helpers, cryptography, virtualization support, and async I/O infrastructure.
• Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.

Dependency Surface

• linux/export.h
• mpi-internal.h

Detected Declarations

• function mpi_sub_ui
• export mpi_sub_ui

Annotated Snippet

if (u->nlimbs == 1 && u->d[0] < vval) {
			w->d[0] = vval - u->d[0];
			w->nlimbs = 1;
			w->sign = 1;
		} else {
			mpihelp_sub_1(w->d, u->d, u->nlimbs, (mpi_limb_t) vval);
			/* Size can decrease with at most one limb. */
			w->nlimbs = (u->nlimbs - (w->d[u->nlimbs - 1] == 0));
			w->sign = 0;
		}
	}

	mpi_normalize(w);
	return 0;
}
EXPORT_SYMBOL_GPL(mpi_sub_ui);

Annotation

• Immediate include surface: `linux/export.h`, `mpi-internal.h`.
• Detected declarations: `function mpi_sub_ui`, `export mpi_sub_ui`.
• Atlas domain: Kernel Services / lib.
• Implementation status: integration 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.