From 7f0677197a91283edec4190c040df32f2da751a1 Mon Sep 17 00:00:00 2001 From: Taylor R Campbell Date: Thu, 31 Mar 2022 02:37:59 +0000 Subject: [PATCH 34/49] kern: Set l_mutex with atomic_store_release. Nix membar_exit. --- sys/kern/kern_lwp.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/sys/kern/kern_lwp.c b/sys/kern/kern_lwp.c index 9af79c9bec01..273a44a6dbe3 100644 --- a/sys/kern/kern_lwp.c +++ b/sys/kern/kern_lwp.c @@ -1567,8 +1567,7 @@ lwp_setlock(struct lwp *l, kmutex_t *mtx) KASSERT(mutex_owned(oldmtx)); - membar_exit(); - l->l_mutex = mtx; + atomic_store_release(&l->l_mutex, mtx); return oldmtx; } @@ -1584,8 +1583,7 @@ lwp_unlock_to(struct lwp *l, kmutex_t *mtx) KASSERT(lwp_locked(l, NULL)); old = l->l_mutex; - membar_exit(); - l->l_mutex = mtx; + atomic_store_release(&l->l_mutex, mtx); mutex_spin_exit(old); }