D39808.diff
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	diff --git a/sys/kern/vfs_bio.c b/sys/kern/vfs_bio.c
	--- a/sys/kern/vfs_bio.c
	+++ b/sys/kern/vfs_bio.c
	@@ -118,7 +118,7 @@
	#define BQ_ASSERT_LOCKED(bq) mtx_assert(BQ_LOCKPTR((bq)), MA_OWNED)

	struct bufdomain {
	- struct bufqueue bd_subq[MAXCPU + 1]; /* Per-cpu sub queues + global */
	+ struct bufqueue *bd_subq;
	struct bufqueue bd_dirtyq;
	struct bufqueue *bd_cleanq;
	struct mtx_padalign bd_run_lock;
	@@ -1914,6 +1914,9 @@
	{
	int i;

	+ /* Per-CPU clean buf queues, plus one global queue. */
	+ bd->bd_subq = mallocarray(mp_maxid + 2, sizeof(struct bufqueue),
	+ M_BIOBUF, M_WAITOK \| M_ZERO);
	bd->bd_cleanq = &bd->bd_subq[mp_maxid + 1];
	bq_init(bd->bd_cleanq, QUEUE_CLEAN, mp_maxid + 1, "bufq clean lock");
	bq_init(&bd->bd_dirtyq, QUEUE_DIRTY, -1, "bufq dirty lock");