[src/trunk]: src/sys/uvm Redefine ptoa() to be the inverse of atop. If you w...

[matt <matt%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/f86680d86501
branches:  trunk
changeset: 771695:f86680d86501
user:      matt <matt%NetBSD.org@localhost>
date:      Tue Nov 29 07:43:54 2011 +0000

description:
Redefine ptoa() to be the inverse of atop.  If you were using a 32-bit vaddr_t
with 64-bit paddr_t and using managed addresses > 4GB, uvm_page_init would
silently discard the upper 32-bits of the physical address possibly double
mapping pages.

diffstat:

 sys/uvm/uvm_param.h |  4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diffs (18 lines):

diff -r d66e5daefd5a -r f86680d86501 sys/uvm/uvm_param.h
--- a/sys/uvm/uvm_param.h       Tue Nov 29 03:50:31 2011 +0000
+++ b/sys/uvm/uvm_param.h       Tue Nov 29 07:43:54 2011 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: uvm_param.h,v 1.25 2010/11/14 04:31:02 uebayasi Exp $  */
+/*     $NetBSD: uvm_param.h,v 1.26 2011/11/29 07:43:54 matt Exp $      */
 
 /*
  * Copyright (c) 1991, 1993
@@ -199,7 +199,7 @@
  */
 #ifdef _KERNEL
 #define        atop(x)         (((paddr_t)(x)) >> PAGE_SHIFT)
-#define        ptoa(x)         ((vaddr_t)((vaddr_t)(x) << PAGE_SHIFT))
+#define        ptoa(x)         (((paddr_t)(x)) << PAGE_SHIFT)
 
 /*
  * Round off or truncate to the nearest page.  These will work