mirror of
https://github.com/torvalds/linux.git
synced 2024-12-05 10:32:35 +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>
39 lines
644 B
Plaintext
39 lines
644 B
Plaintext
C WRC+pooncerelease+fencermbonceonce+Once
|
|
|
|
(*
|
|
* Result: Never
|
|
*
|
|
* This litmus test is an extension of the message-passing pattern, where
|
|
* the first write is moved to a separate process. Because it features
|
|
* a release and a read memory barrier, it should be forbidden. More
|
|
* specifically, this litmus test is forbidden because smp_store_release()
|
|
* is A-cumulative in LKMM.
|
|
*)
|
|
|
|
{}
|
|
|
|
P0(int *x)
|
|
{
|
|
WRITE_ONCE(*x, 1);
|
|
}
|
|
|
|
P1(int *x, int *y)
|
|
{
|
|
int r0;
|
|
|
|
r0 = READ_ONCE(*x);
|
|
smp_store_release(y, 1);
|
|
}
|
|
|
|
P2(int *x, int *y)
|
|
{
|
|
int r0;
|
|
int r1;
|
|
|
|
r0 = READ_ONCE(*y);
|
|
smp_rmb();
|
|
r1 = READ_ONCE(*x);
|
|
}
|
|
|
|
exists (1:r0=1 /\ 2:r0=1 /\ 2:r1=0)
|