mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-30 08:02:30 +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>
45 lines
731 B
Text
45 lines
731 B
Text
C IRIW+fencembonceonces+OnceOnce
|
|
|
|
(*
|
|
* Result: Never
|
|
*
|
|
* Test of independent reads from independent writes with smp_mb()
|
|
* between each pairs of reads. In other words, is smp_mb() sufficient to
|
|
* cause two different reading processes to agree on the order of a pair
|
|
* of writes, where each write is to a different variable by a different
|
|
* process? This litmus test exercises LKMM's "propagation" rule.
|
|
*)
|
|
|
|
{}
|
|
|
|
P0(int *x)
|
|
{
|
|
WRITE_ONCE(*x, 1);
|
|
}
|
|
|
|
P1(int *x, int *y)
|
|
{
|
|
int r0;
|
|
int r1;
|
|
|
|
r0 = READ_ONCE(*x);
|
|
smp_mb();
|
|
r1 = READ_ONCE(*y);
|
|
}
|
|
|
|
P2(int *y)
|
|
{
|
|
WRITE_ONCE(*y, 1);
|
|
}
|
|
|
|
P3(int *x, int *y)
|
|
{
|
|
int r0;
|
|
int r1;
|
|
|
|
r0 = READ_ONCE(*y);
|
|
smp_mb();
|
|
r1 = READ_ONCE(*x);
|
|
}
|
|
|
|
exists (1:r0=1 /\ 1:r1=0 /\ 3:r0=1 /\ 3:r1=0)
|