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

[tip-bot for Paul E. McKenney]

Commit-ID:  bfd403bb3617e17a272e1189e5c76253052c22b8
Gitweb:     https://git.kernel.org/tip/bfd403bb3617e17a272e1189e5c76253052c22b8
Author:     Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
AuthorDate: Mon, 14 May 2018 16:33:44 -0700
Committer:  Ingo Molnar <mingo@xxxxxxxxxx>
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@xxxxxxxxxxxxxxxxxx>
Acked-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Cc: akiyks@xxxxxxxxx
Cc: boqun.feng@xxxxxxxxx
Cc: dhowells@xxxxxxxxxx
Cc: j.alglave@xxxxxxxxx
Cc: linux-arch@xxxxxxxxxxxxxxx
Cc: luc.maranget@xxxxxxxx
Cc: npiggin@xxxxxxxxx
Cc: parri.andrea@xxxxxxxxx
Link: http://lkml.kernel.org/r/1526340837-12222-6-git-send-email-paulmck@xxxxxxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
 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