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critical_{enter, exit}: add missing compiler barrier

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Reported by:	markj
This commit is contained in:
Matt Macy 2018-07-08 19:35:29 +00:00
parent 952dd10db4
commit 3843df3fdc
1 changed files with 2 additions and 0 deletions
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2
sys/sys/systm.h
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@ -238,6 +238,7 @@ critical_enter(void)
td = (struct thread_lite *)curthread;
td->td_critnest++;
__compiler_membar();
}
static __inline void
@ -248,6 +249,7 @@ critical_exit(void)
td = (struct thread_lite *)curthread;
KASSERT(td->td_critnest != 0,
("critical_exit: td_critnest == 0"));
__compiler_membar();
td->td_critnest--;
__compiler_membar();
if (__predict_false(td->td_owepreempt))