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| 47 | * |
47 | * |
| 48 | * @return Value of the atomic variable as it existed before addition. |
48 | * @return Value of the atomic variable as it existed before addition. |
| 49 | */ |
49 | */ |
| 50 | static inline long atomic_add(atomic_t *val, int i) |
50 | static inline long atomic_add(atomic_t *val, int i) |
| 51 | { |
51 | { |
| 52 | __u64 a, b; |
52 | uint64_t a, b; |
| 53 | volatile __u64 x = (__u64) &val->count; |
53 | volatile uint64_t x = (uint64_t) &val->count; |
| 54 | 54 | ||
| 55 | __asm__ volatile ( |
55 | __asm__ volatile ( |
| 56 | "0:\n" |
56 | "0:\n" |
| 57 | "ldx %0, %1\n" |
57 | "ldx %0, %1\n" |
| 58 | "add %1, %3, %2\n" |
58 | "add %1, %3, %2\n" |
| 59 | "casx %0, %1, %2\n" |
59 | "casx %0, %1, %2\n" |
| 60 | "cmp %1, %2\n" |
60 | "cmp %1, %2\n" |
| 61 | "bne 0b\n" /* The operation failed and must be attempted again if a != b. */ |
61 | "bne 0b\n" /* The operation failed and must be attempted again if a != b. */ |
| 62 | "nop\n" |
62 | "nop\n" |
| 63 | : "=m" (*((__u64 *)x)), "=r" (a), "=r" (b) |
63 | : "=m" (*((uint64_t *)x)), "=r" (a), "=r" (b) |
| 64 | : "r" (i) |
64 | : "r" (i) |
| 65 | ); |
65 | ); |
| 66 | 66 | ||
| 67 | return a; |
67 | return a; |
| 68 | } |
68 | } |