projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 1c27b644 PM |
1 | C ISA2+poonceonces |
| 2 | ||
| 8f32543b PM |
3 | (* |
| 4 | * Result: Sometimes | |
| 5 | * | |
| 6 | * Given a release-acquire chain ordering the first process's store | |
| 7 | * against the last process's load, is ordering preserved if all of the | |
| 8 | * smp_store_release() invocations are replaced by WRITE_ONCE() and all | |
| 9 | * of the smp_load_acquire() invocations are replaced by READ_ONCE()? | |
| 10 | *) | |
| 11 | ||
| 5c587f9b | 12 | {} |
| 1c27b644 PM |
13 | |
| 14 | P0(int *x, int *y) | |
| 15 | { | |
| 16 | WRITE_ONCE(*x, 1); | |
| 17 | WRITE_ONCE(*y, 1); | |
| 18 | } | |
| 19 | ||
| 20 | P1(int *y, int *z) | |
| 21 | { | |
| 22 | int r0; | |
| 23 | ||
| 24 | r0 = READ_ONCE(*y); | |
| 25 | WRITE_ONCE(*z, 1); | |
| 26 | } | |
| 27 | ||
| 28 | P2(int *x, int *z) | |
| 29 | { | |
| 30 | int r0; | |
| 31 | int r1; | |
| 32 | ||
| 33 | r0 = READ_ONCE(*z); | |
| 34 | r1 = READ_ONCE(*x); | |
| 35 | } | |
| 36 | ||
| 37 | exists (1:r0=1 /\ 2:r0=1 /\ 2:r1=0) |