linux-kernel - [tip:locking/core] tools/memory-order: Update the cheat-sheet to show that smp_mb__after

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Message-ID: <tip-bfd403bb3617e17a272e1189e5c76253052c22b8@git.kernel.org>
Date:   Mon, 14 May 2018 23:29:43 -0700
From:   "tip-bot for Paul E. McKenney" <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
        mingo@...nel.org, tglx@...utronix.de, peterz@...radead.org,
        stern@...land.harvard.edu, will.deacon@....com, hpa@...or.com,
        paulmck@...ux.vnet.ibm.com, torvalds@...ux-foundation.org
Subject: [tip:locking/core] tools/memory-order: Update the cheat-sheet to
 show that smp_mb__after_atomic() orders later RMW operations

Commit-ID:  bfd403bb3617e17a272e1189e5c76253052c22b8
Gitweb:     https://git.kernel.org/tip/bfd403bb3617e17a272e1189e5c76253052c22b8
Author:     Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
AuthorDate: Mon, 14 May 2018 16:33:44 -0700
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 15 May 2018 08:11:16 +0200

tools/memory-order: Update the cheat-sheet to show that smp_mb__after_atomic() orders later RMW operations

The current cheat sheet does not claim that smp_mb__after_atomic()
orders later RMW atomic operations, which it must, at least against
earlier RMW atomic operations and whatever precedes them.

This commit therefore adds the needed "Y".

Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Acked-by: Alan Stern <stern@...land.harvard.edu>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Will Deacon <will.deacon@....com>
Cc: akiyks@...il.com
Cc: boqun.feng@...il.com
Cc: dhowells@...hat.com
Cc: j.alglave@....ac.uk
Cc: linux-arch@...r.kernel.org
Cc: luc.maranget@...ia.fr
Cc: npiggin@...il.com
Cc: parri.andrea@...il.com
Link: http://lkml.kernel.org/r/1526340837-12222-6-git-send-email-paulmck@linux.vnet.ibm.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 tools/memory-model/Documentation/cheatsheet.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/memory-model/Documentation/cheatsheet.txt b/tools/memory-model/Documentation/cheatsheet.txt
index 46fe79afc737..33ba98d72b16 100644
--- a/tools/memory-model/Documentation/cheatsheet.txt
+++ b/tools/memory-model/Documentation/cheatsheet.txt
@@ -14,7 +14,7 @@ smp_wmb()                                  Y    W           Y       Y    W
 smp_mb() & synchronize_rcu()  CP        Y  Y    Y        Y  Y   Y   Y    Y
 Successful full non-void RMW  CP     Y  Y  Y    Y     Y  Y  Y   Y   Y    Y   Y
 smp_mb__before_atomic()       CP        Y  Y    Y        a  a   a   a    Y
-smp_mb__after_atomic()        CP        a  a    Y        Y  Y   Y   Y
+smp_mb__after_atomic()        CP        a  a    Y        Y  Y   Y   Y    Y
 
 
 Key:	C:	Ordering is cumulative