linux-kernel - [PATCH 1/2] tools/memory-model: Model 'smp_store

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Message-Id: <1523535770-10781-2-git-send-email-andrea.parri@amarulasolutions.com>
Date:   Thu, 12 Apr 2018 14:22:49 +0200
From:   Andrea Parri <andrea.parri@...rulasolutions.com>
To:     linux-kernel@...r.kernel.org
Cc:     Alan Stern <stern@...land.harvard.edu>,
        Will Deacon <will.deacon@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Boqun Feng <boqun.feng@...il.com>,
        Nicholas Piggin <npiggin@...il.com>,
        David Howells <dhowells@...hat.com>,
        Jade Alglave <j.alglave@....ac.uk>,
        Luc Maranget <luc.maranget@...ia.fr>,
        "Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
        Akira Yokosawa <akiyks@...il.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Andrea Parri <andrea.parri@...rulasolutions.com>
Subject: [PATCH 1/2] tools/memory-model: Model 'smp_store_mb()'

Says that 'smp_store_mb(x, val);' is _semantically_ equivalent to
'WRITE_ONCE(x, val); smp_mb();'.

Suggested-by: Paolo Bonzini <pbonzini@...hat.com>
Suggested-by: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: Andrea Parri <andrea.parri@...rulasolutions.com>
---
 tools/memory-model/linux-kernel.def | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/memory-model/linux-kernel.def b/tools/memory-model/linux-kernel.def
index 397e4e67e8c84..acf86f6f360a7 100644
--- a/tools/memory-model/linux-kernel.def
+++ b/tools/memory-model/linux-kernel.def
@@ -14,6 +14,7 @@ smp_store_release(X,V) { __store{release}(*X,V); }
 smp_load_acquire(X) __load{acquire}(*X)
 rcu_assign_pointer(X,V) { __store{release}(X,V); }
 rcu_dereference(X) __load{once}(X)
+smp_store_mb(X,V) { __store{once}(X,V); __fence{mb}; }
 
 // Fences
 smp_mb() { __fence{mb} ; }
-- 
2.7.4