mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-03 15:47:36 +00:00
8f32543b61
This commit adds comments to the litmus tests summarizing what these tests are intended to demonstrate. [ paulmck: Apply Andrea's and Alan's feedback. ] Suggested-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: akiyks@gmail.com Cc: boqun.feng@gmail.com Cc: dhowells@redhat.com Cc: j.alglave@ucl.ac.uk Cc: linux-arch@vger.kernel.org Cc: luc.maranget@inria.fr Cc: nborisov@suse.com Cc: npiggin@gmail.com Cc: parri.andrea@gmail.com Cc: stern@rowland.harvard.edu Cc: will.deacon@arm.com Link: http://lkml.kernel.org/r/1519169112-20593-4-git-send-email-paulmck@linux.vnet.ibm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
35 lines
465 B
Text
35 lines
465 B
Text
C WRC+poonceonces+Once
|
|
|
|
(*
|
|
* Result: Sometimes
|
|
*
|
|
* This litmus test is an extension of the message-passing pattern,
|
|
* where the first write is moved to a separate process. Note that this
|
|
* test has no ordering at all.
|
|
*)
|
|
|
|
{}
|
|
|
|
P0(int *x)
|
|
{
|
|
WRITE_ONCE(*x, 1);
|
|
}
|
|
|
|
P1(int *x, int *y)
|
|
{
|
|
int r0;
|
|
|
|
r0 = READ_ONCE(*x);
|
|
WRITE_ONCE(*y, 1);
|
|
}
|
|
|
|
P2(int *x, int *y)
|
|
{
|
|
int r0;
|
|
int r1;
|
|
|
|
r0 = READ_ONCE(*y);
|
|
r1 = READ_ONCE(*x);
|
|
}
|
|
|
|
exists (1:r0=1 /\ 2:r0=1 /\ 2:r1=0)
|