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authorAlan Stern <stern@rowland.harvard.edu>2018-05-14 16:33:50 -0700
committerIngo Molnar <mingo@kernel.org>2018-05-15 08:11:17 +0200
commit8559183ccaec97454b2515ac426f113967256cf9 (patch)
tree6aee2f09189b0b9441ecfb3c399078158424fb71 /Documentation/RCU/lockdep.txt
parent1bd3742043fa44dd0ec25770abdcdfe1f6e8681e (diff)
tools/memory-model: Remove duplicated code from lock.cat
This patch simplifies the implementation of spin_is_locked in the LKMM. It capitalizes on the fact that a failed spin_trylock() and a spin_is_locked() which returns True have exactly the same semantics (those of READ_ONCE) and ordering properties (none). Therefore the two kinds of events can be combined and handled by the same code, instead of treated separately as they are currently. Tested-by: Andrea Parri <andrea.parri@amarulasolutions.com> Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Akira Yokosawa <akiyks@gmail.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Boqun Feng <boqun.feng@gmail.com> Cc: David Howells <dhowells@redhat.com> Cc: Jade Alglave <j.alglave@ucl.ac.uk> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Luc Maranget <luc.maranget@inria.fr> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will.deacon@arm.com> Cc: linux-arch@vger.kernel.org Cc: parri.andrea@gmail.com Link: http://lkml.kernel.org/r/1526340837-12222-12-git-send-email-paulmck@linux.vnet.ibm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
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