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Date: Sun, 14 Jan 2018 01:24:41 +0200
From: Konstantin Belousov <kostikbel@gmail.com>
To: Nathan Whitehorn <nwhitehorn@FreeBSD.org>
Cc: src-committers@freebsd.org, svn-src-all@freebsd.org,
 svn-src-head@freebsd.org
Subject: Re: svn commit: r327950 - in head/sys/powerpc: aim include powerpc ps3
Message-ID: <20180113232441.GV1684@kib.kiev.ua>
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On Sat, Jan 13, 2018 at 11:14:53PM +0000, Nathan Whitehorn wrote:
> +/*
> + * We (usually) have a direct map of all physical memory. All
> + * uses of this macro must be gated by a check on hw_direct_map!
> + * The location of the direct map may not be 1:1 in future, so use
> + * of the macro is recommended; it may also grow an assert that hw_direct_map
> + * is set.
> + */
> +#define PHYS_TO_DMAP(x) x
> +#define DMAP_TO_PHYS(x) x

Take a look at the sys/vm/vm_page.c:vm_page_free_prep() function.