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tools/memory-model: Add litmus test for full multicopy atomicity This commit adds a litmus test suggested by Alan Stern that is forbidden on fully multicopy atomic systems, but allowed on other-multicopy and on non-multicopy atomic systems. For reference, s390 is fully multicopy atomic, x86 and ARMv8 are other-multicopy atomic, and ARMv7 and powerpc are non-multicopy atomic. Suggested-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Acked-by: Andrea Parri <andrea.parri@amarulasolutions.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.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: npiggin@gmail.com Cc: parri.andrea@gmail.com Cc: will.deacon@arm.com Link: http://lkml.kernel.org/r/20180716180605.16115-1-paulmck@linux.vnet.ibm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2018-07-17 02:05:52 +08:00
C SB+rfionceonce-poonceonces
(*
* Result: Sometimes
*
* This litmus test demonstrates that LKMM is not fully multicopy atomic.
*)
tools/memory-model: Remove redundant initialization in litmus tests This is a revert of commit 1947bfcf81a9 ("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>
2020-11-28 07:43:45 +08:00
{}
tools/memory-model: Add litmus test for full multicopy atomicity This commit adds a litmus test suggested by Alan Stern that is forbidden on fully multicopy atomic systems, but allowed on other-multicopy and on non-multicopy atomic systems. For reference, s390 is fully multicopy atomic, x86 and ARMv8 are other-multicopy atomic, and ARMv7 and powerpc are non-multicopy atomic. Suggested-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Acked-by: Andrea Parri <andrea.parri@amarulasolutions.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.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: npiggin@gmail.com Cc: parri.andrea@gmail.com Cc: will.deacon@arm.com Link: http://lkml.kernel.org/r/20180716180605.16115-1-paulmck@linux.vnet.ibm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2018-07-17 02:05:52 +08:00
P0(int *x, int *y)
{
int r1;
int r2;
WRITE_ONCE(*x, 1);
r1 = READ_ONCE(*x);
r2 = READ_ONCE(*y);
}
P1(int *x, int *y)
{
int r3;
int r4;
WRITE_ONCE(*y, 1);
r3 = READ_ONCE(*y);
r4 = READ_ONCE(*x);
}
locations [0:r1; 1:r3; x; y] (* Debug aid: Print things not in "exists". *)
exists (0:r2=0 /\ 1:r4=0)