drivers/md/dm-vdo/murmurhash3.c

Source file repositories/reference/linux-study-clean/drivers/md/dm-vdo/murmurhash3.c

File Facts

System
Linux kernel
Corpus path
drivers/md/dm-vdo/murmurhash3.c
Extension
.c
Size
2656 bytes
Lines
156
Domain
Driver Families
Bucket
drivers/md
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

switch (len & 15) {
		case 15:
			k2 ^= ((u64)tail[14]) << 48;
			fallthrough;
		case 14:
			k2 ^= ((u64)tail[13]) << 40;
			fallthrough;
		case 13:
			k2 ^= ((u64)tail[12]) << 32;
			fallthrough;
		case 12:
			k2 ^= ((u64)tail[11]) << 24;
			fallthrough;
		case 11:
			k2 ^= ((u64)tail[10]) << 16;
			fallthrough;
		case 10:
			k2 ^= ((u64)tail[9]) << 8;
			fallthrough;
		case 9:
			k2 ^= ((u64)tail[8]) << 0;
			k2 *= c2;
			k2 = ROTL64(k2, 33);
			k2 *= c1;
			h2 ^= k2;
			fallthrough;

		case 8:
			k1 ^= ((u64)tail[7]) << 56;
			fallthrough;
		case 7:
			k1 ^= ((u64)tail[6]) << 48;
			fallthrough;
		case 6:
			k1 ^= ((u64)tail[5]) << 40;
			fallthrough;
		case 5:
			k1 ^= ((u64)tail[4]) << 32;
			fallthrough;
		case 4:
			k1 ^= ((u64)tail[3]) << 24;
			fallthrough;
		case 3:
			k1 ^= ((u64)tail[2]) << 16;
			fallthrough;
		case 2:
			k1 ^= ((u64)tail[1]) << 8;
			fallthrough;
		case 1:
			k1 ^= ((u64)tail[0]) << 0;
			k1 *= c1;
			k1 = ROTL64(k1, 31);
			k1 *= c2;
			h1 ^= k1;
			break;
		default:
			break;
		}
	}
	/* finalization */

	h1 ^= len;
	h2 ^= len;

	h1 += h2;
	h2 += h1;

	h1 = fmix64(h1);
	h2 = fmix64(h2);

	h1 += h2;
	h2 += h1;

	put_unaligned_le64(h1, &hash_out[0]);
	put_unaligned_le64(h2, &hash_out[1]);
}

Annotation

Implementation Notes