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@linux.vnet.ibm.com> Acked-by: Alan 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/1526340837-12222-6-git-send-email-paulmck@linux.vnet.ibm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -14,7 +14,7 @@ smp_wmb() Y W Y Y W
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smp_mb() & synchronize_rcu() CP Y Y Y Y Y Y Y Y
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Successful full non-void RMW CP Y Y Y Y Y Y Y Y Y Y Y
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smp_mb__before_atomic() CP Y Y Y a a a a Y
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smp_mb__after_atomic() CP a a Y Y Y Y Y
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smp_mb__after_atomic() CP a a Y Y Y Y Y Y
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Key: C: Ordering is cumulative
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