diff options
Diffstat (limited to 'sys/kern')
| -rw-r--r-- | sys/kern/subr_smp.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/sys/kern/subr_smp.c b/sys/kern/subr_smp.c index b1be3fa..945ef6f 100644 --- a/sys/kern/subr_smp.c +++ b/sys/kern/subr_smp.c @@ -102,7 +102,14 @@ static void (*smp_rv_action_func)(void *arg); static void (*smp_rv_teardown_func)(void *arg); static void *smp_rv_func_arg; static volatile int smp_rv_waiters[2]; -static struct mtx smp_rv_mtx; + +/* + * Shared mutex to restrict busywaits between smp_rendezvous() and + * smp(_targeted)_tlb_shootdown(). A deadlock occurs if both of these + * functions trigger at once and cause multiple CPUs to busywait with + * interrupts disabled. + */ +struct mtx smp_rv_mtx; /* * Let the MD SMP code initialize mp_maxid very early if it can. |
