Messages in this thread Patch in this message | | | Date | Mon, 14 May 2018 23:29:43 -0700 | From | "tip-bot for Paul E. McKenney" <> | Subject | [tip:locking/core] tools/memory-order: Update the cheat-sheet to show that smp_mb__after_atomic() orders later RMW operations |
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Commit-ID: bfd403bb3617e17a272e1189e5c76253052c22b8 Gitweb: https://git.kernel.org/tip/bfd403bb3617e17a272e1189e5c76253052c22b8 Author: Paul E. McKenney <paulmck@linux.vnet.ibm.com> AuthorDate: Mon, 14 May 2018 16:33:44 -0700 Committer: Ingo Molnar <mingo@kernel.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@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> --- 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
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