Add membar_sync
Provides the missing full barrier variant to the membar primitive set. While not used right now, this is probably going to change down the road. Name taken from Solaris, to follow the existing routines. Reviewed-by: Richard Yao <richard.yao@alumni.stonybrook.edu> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Mateusz Guzik <mjguzik@gmail.com> Closes #13907
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@ -59,6 +59,7 @@ extern uint64_t atomic_cas_64(volatile uint64_t *target, uint64_t cmp,
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#define membar_consumer() atomic_thread_fence_acq()
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#define membar_producer() atomic_thread_fence_rel()
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#define membar_sync() atomic_thread_fence_seq_cst()
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static __inline uint32_t
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atomic_add_32_nv(volatile uint32_t *target, int32_t delta)
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@ -46,6 +46,7 @@
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#define membar_consumer() smp_rmb()
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#define membar_producer() smp_wmb()
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#define membar_sync() smp_mb()
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#define physmem zfs_totalram_pages
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@ -381,6 +381,12 @@ membar_exit(void)
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__atomic_thread_fence(__ATOMIC_SEQ_CST);
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}
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void
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membar_sync(void)
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{
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__atomic_thread_fence(__ATOMIC_SEQ_CST);
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}
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void
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membar_producer(void)
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{
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@ -313,6 +313,13 @@ extern void membar_enter(void);
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*/
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extern void membar_exit(void);
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/*
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* Make all stores and loads emitted prior to the the barrier complete before
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* crossing it, while also making sure stores and loads emitted after the
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* barrier only start being executed after crossing it.
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*/
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extern void membar_sync(void);
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/*
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* Arrange that all stores issued before this point in the code reach
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* global visibility before any stores that follow; useful in producer
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