mirror of
https://github.com/torvalds/linux.git
synced 2024-12-04 01:51:34 +00:00
5c587f9b9c
This is a revert of commit 1947bfcf81 ("tools/memory-model: Add types
to litmus tests") with conflict resolutions.
klitmus7 [1] is aware of default types of "int" and "int*".
It accepts litmus tests for herd7 without extra type info unless
non-"int" variables are referenced by an "exists", "locations",
or "filter" directive.
[1]: Tested with klitmus7 versions 7.49 or later.
Suggested-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Akira Yokosawa <akiyks@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
43 lines
723 B
Plaintext
43 lines
723 B
Plaintext
C Z6.0+pooncelock+poonceLock+pombonce
|
|
|
|
(*
|
|
* Result: Never
|
|
*
|
|
* This litmus test demonstrates how smp_mb__after_spinlock() may be
|
|
* used to ensure that accesses in different critical sections for a
|
|
* given lock running on different CPUs are nevertheless seen in order
|
|
* by CPUs not holding that lock.
|
|
*)
|
|
|
|
{}
|
|
|
|
P0(int *x, int *y, spinlock_t *mylock)
|
|
{
|
|
spin_lock(mylock);
|
|
WRITE_ONCE(*x, 1);
|
|
WRITE_ONCE(*y, 1);
|
|
spin_unlock(mylock);
|
|
}
|
|
|
|
P1(int *y, int *z, spinlock_t *mylock)
|
|
{
|
|
int r0;
|
|
|
|
spin_lock(mylock);
|
|
smp_mb__after_spinlock();
|
|
r0 = READ_ONCE(*y);
|
|
WRITE_ONCE(*z, 1);
|
|
spin_unlock(mylock);
|
|
}
|
|
|
|
P2(int *x, int *z)
|
|
{
|
|
int r1;
|
|
|
|
WRITE_ONCE(*z, 2);
|
|
smp_mb();
|
|
r1 = READ_ONCE(*x);
|
|
}
|
|
|
|
exists (1:r0=1 /\ z=2 /\ 2:r1=0)
|