const golang.org/x/sys/unix.MAP_NORESERVE

one use

	golang.org/x/sys/unix (current package)
		zerrors_linux_amd64.go#L121: 	MAP_NORESERVE                    = 0x4000

The pages are generated with Golds v0.4.9. (GOOS=linux GOARCH=amd64)