D29215.diff
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	diff --git a/share/man/man9/counter.9 b/share/man/man9/counter.9
	--- a/share/man/man9/counter.9
	+++ b/share/man/man9/counter.9
	@@ -25,7 +25,7 @@
	.\"
	.\" $FreeBSD$
	.\"
	-.Dd March 6, 2020
	+.Dd March 11, 2021
	.Dt COUNTER 9
	.Os
	.Sh NAME
	@@ -98,10 +98,13 @@
	.Va M_WAITOK .
	If
	.Va M_NOWAIT
	-is specified the operation may fail.
	+is specified the operation may fail and return
	+.Dv NULL .
	.It Fn counter_u64_free c
	Free the previously allocated counter
	.Fa c .
	+It is safe to pass
	+.Dv NULL .
	.It Fn counter_u64_add c v
	Add
	.Fa v
	diff --git a/share/man/man9/zone.9 b/share/man/man9/zone.9
	--- a/share/man/man9/zone.9
	+++ b/share/man/man9/zone.9
	@@ -25,7 +25,7 @@
	.\"
	.\" $FreeBSD$
	.\"
	-.Dd August 20, 2020
	+.Dd March 11, 2021
	.Dt UMA 9
	.Os
	.Sh NAME
	@@ -385,6 +385,22 @@
	and
	.Dv dtor
	functions of the zone, respectively.
	+The variants
	+.Fn uma_zalloc_pcpu
	+and
	+.Fn uma_zfree_pcpu
	+allocate and free
	+.Va mp_ncpu
	+shadow copies as described for
	+.Dv UMA_ZONE_PCPU .
	+If
	+.Fa item
	+is
	+.Dv NULL ,
	+then
	+.Fn uma_zfree_pcpu
	+does nothing.
	+.Pp
	The
	.Fn uma_zalloc_domain
	function allows callers to specify a fixed