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Commit 1bd37420 authored by Paul E. McKenney's avatar Paul E. McKenney Committed by Ingo Molnar
Browse files

tools/memory-model: Flag "cumulativity" and "propagation" tests 



This commit flags WRC+pooncerelease+rmbonceonce+Once.litmus
as being forbidden by smp_store_release() A-cumulativity and
IRIW+mbonceonces+OnceOnce.litmus as being forbidden by the LKMM
propagation rule.

Suggested-by: default avatarAndrea Parri <andrea.parri@amarulasolutions.com>
Reported-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
[ paulmck: Updated wording as suggested by Alan Stern. ]
Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will.deacon@arm.com>
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
Link: http://lkml.kernel.org/r/1526340837-12222-11-git-send-email-paulmck@linux.vnet.ibm.com


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 15553dcb

tools/memory-model/litmus-tests/IRIW+mbonceonces+OnceOnce.litmus

+1 −1
Original line number Diff line number Diff line
@@ -7,7 +7,7 @@ C IRIW+mbonceonces+OnceOnce 
 * 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?

 * process?  This litmus test exercises LKMM's "propagation" rule.

 *)



{}

tools/memory-model/litmus-tests/README

+6 −3
Original line number Diff line number Diff line
@@ -23,7 +23,8 @@ IRIW+mbonceonces+OnceOnce.litmus 
	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?

	variable by a different process?  This litmus test is forbidden

	by LKMM's propagation rule.



IRIW+poonceonces+OnceOnce.litmus

	Test of independent reads from independent writes with nothing
@@ -119,8 +120,10 @@ S+wmbonceonce+poacquireonce.litmus 


WRC+poonceonces+Once.litmus

WRC+pooncerelease+rmbonceonce+Once.litmus

	These two are members of an extension of the MP litmus-test class

	in which the first write is moved to a separate process.

	These two are members of an extension of the MP litmus-test

	class in which the first write is moved to a separate process.

	The second is forbidden because smp_store_release() is

	A-cumulative in LKMM.



Z6.0+pooncelock+pooncelock+pombonce.litmus

	Is the ordering provided by a spin_unlock() and a subsequent

tools/memory-model/litmus-tests/WRC+pooncerelease+rmbonceonce+Once.litmus

+3 −1
Original line number Diff line number Diff line
@@ -5,7 +5,9 @@ C WRC+pooncerelease+rmbonceonce+Once 
 *

 * 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.

 * 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.

 *)



{}