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locking/barriers, tile: Provide TILE specific smp_acquire__after_ctrl_dep()
Since TILE doesn't do read speculation, its control dependencies also guarantee LOAD->LOAD order and we don't need the additional RMB otherwise required to provide ACQUIRE semantics. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Chris Metcalf <cmetcalf@mellanox.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -87,6 +87,13 @@ mb_incoherent(void)
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#define __smp_mb__after_atomic() __smp_mb()
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#endif
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/*
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* The TILE architecture does not do speculative reads; this ensures
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* that a control dependency also orders against loads and already provides
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* a LOAD->{LOAD,STORE} order and can forgo the additional RMB.
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*/
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#define smp_acquire__after_ctrl_dep() barrier()
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#include <asm-generic/barrier.h>
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#endif /* !__ASSEMBLY__ */
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