From 4b76112dc43b775abd3deb2d9f65458ca08424ee Mon Sep 17 00:00:00 2001 From: Florin Coras Date: Thu, 21 Mar 2019 13:54:53 -0700 Subject: session/fifo: make event unset atomic Ensures that fifo cursize loads cannot be speculated to before the event unset. Change-Id: Ia7c20c510d58f26a8e9b82d3982c6d4143a3a4d6 Signed-off-by: Florin Coras --- src/svm/svm_fifo.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'src/svm') diff --git a/src/svm/svm_fifo.h b/src/svm/svm_fifo.h index d7146ae1fb0..6c3940dfad5 100644 --- a/src/svm/svm_fifo.h +++ b/src/svm/svm_fifo.h @@ -179,12 +179,12 @@ svm_fifo_set_event (svm_fifo_t * f) /** * Unsets fifo event flag. * - * Also acts as a release barrier. + * Also acts as an acquire barrier. */ always_inline void svm_fifo_unset_event (svm_fifo_t * f) { - clib_atomic_release (&f->has_event); + __atomic_exchange_n (&f->has_event, 0, __ATOMIC_ACQUIRE); } svm_fifo_t *svm_fifo_create (u32 data_size_in_bytes); -- cgit 1.2.3-korg