D15535.diff
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	Index: head/lib/libc/sys/brk.2
	===================================================================
	--- head/lib/libc/sys/brk.2
	+++ head/lib/libc/sys/brk.2
	@@ -28,7 +28,7 @@
	.\" @(#)brk.2 8.4 (Berkeley) 5/1/95
	.\" $FreeBSD$
	.\"
	-.Dd December 15, 2015
	+.Dd May 24, 2018
	.Dt BRK 2
	.Os
	.Sh NAME
	@@ -51,6 +51,10 @@
	.Fn sbrk
	functions are legacy interfaces from before the
	advent of modern virtual memory management.
	+They are deprecated and not present on the arm64 or riscv architectures.
	+The
	+.Xr mmap 2
	+interface should be used to allocate pages instead.
	.Ef
	.Pp
	The
	@@ -152,6 +156,11 @@
	.Fn brk
	function appeared in
	.At v7 .
	+.Fx 11.0
	+introduced the arm64 and riscv architectures which do not support
	+.Fn brk
	+or
	+.Fn sbrk .
	.Sh BUGS
	Mixing
	.Fn brk
	@@ -168,3 +177,9 @@
	from a failure caused by exceeding the maximum size of
	the data segment without consulting
	.Xr getrlimit 2 .
	+.Pp
	+.Fn sbrk
	+is sometimes used to monitor heap use by calling with an argument of 0.
	+The result is unlikely to reflect actual utilization in combination with an
	+.Xr mmap 2
	+based malloc.