svn commit: r311703 - head/sys/powerpc/include

[Justin Hibbits]

Author: jhibbits
Date: Sun Jan  8 21:12:46 2017
New Revision: 311703
URL: https://svnweb.freebsd.org/changeset/base/311703

Log:
  Knock a page off VM_MAX_KERNEL_ADDRESS
  
  There are places where checks are made against VM_MAX_KERNEL_ADDRESS, or
  virtual_end (set to VM_MAX_KERNEL_ADDRESS).  With 32-bit checks, an address will
  always be less than or equal to 0xffffffff.  Drop a page, so those checks can
  terminate loops safely.

Modified:
  head/sys/powerpc/include/vmparam.h

Modified: head/sys/powerpc/include/vmparam.h
==============================================================================
--- head/sys/powerpc/include/vmparam.h	Sun Jan  8 20:58:58 2017	(r311702)
+++ head/sys/powerpc/include/vmparam.h	Sun Jan  8 21:12:46 2017	(r311703)
@@ -111,7 +111,7 @@
 #define	KERNBASE		0xc0000000	/* start of kernel virtual */
 
 #define	VM_MIN_KERNEL_ADDRESS	KERNBASE
-#define	VM_MAX_KERNEL_ADDRESS	0xffffffff
+#define	VM_MAX_KERNEL_ADDRESS	0xffffefff
 #define	VM_MAX_SAFE_KERNEL_ADDRESS	VM_MAX_KERNEL_ADDRESS
 
 #endif /* AIM/E500 */