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This commit adds a litmus test in which P0() and P1() form a lock-based S litmus test, with the addition of P2(), which observes P0()'s and P1()'s accesses with a full memory barrier but without the lock. This litmus test asks whether writes carried out by two different processes under the same lock will be seen in order by a third process not holding that lock. The answer to this question is "yes" for all architectures supporting the Linux kernel, but is "no" according to the current version of LKMM. A patch to LKMM is under development. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> 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: will.deacon@arm.com Link: http://lkml.kernel.org/r/1519169112-20593-10-git-send-email-paulmck@linux.vnet.ibm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
42 lines
652 B
Plaintext
42 lines
652 B
Plaintext
C ISA2+pooncelock+pooncelock+pombonce.litmus
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(*
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* Result: Sometimes
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*
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* This test shows that the ordering provided by a lock-protected S
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* litmus test (P0() and P1()) are not visible to external process P2().
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* This is likely to change soon.
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*)
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{}
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P0(int *x, int *y, spinlock_t *mylock)
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{
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spin_lock(mylock);
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WRITE_ONCE(*x, 1);
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WRITE_ONCE(*y, 1);
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spin_unlock(mylock);
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}
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P1(int *y, int *z, spinlock_t *mylock)
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{
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int r0;
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spin_lock(mylock);
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r0 = READ_ONCE(*y);
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WRITE_ONCE(*z, 1);
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spin_unlock(mylock);
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}
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P2(int *x, int *z)
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{
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int r1;
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int r2;
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r2 = READ_ONCE(*z);
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smp_mb();
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r1 = READ_ONCE(*x);
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}
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exists (1:r0=1 /\ 2:r2=1 /\ 2:r1=0)
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