svn commit: r244080 - head/sys/kern

[Andre Oppermann]

Author: andre
Date: Mon Dec 10 12:19:03 2012
New Revision: 244080
URL: http://svnweb.freebsd.org/changeset/base/244080

Log:
  Prevent long type overflow of realmem calculation on ILP32 by forcing
  calculation to be in quad_t space.  Fix style issue with second parameter
  to qmin().
  
  Reported by:	alc
  Reviewed by:	bde, alc

Modified:
  head/sys/kern/subr_param.c

Modified: head/sys/kern/subr_param.c
==============================================================================
--- head/sys/kern/subr_param.c	Mon Dec 10 11:26:18 2012	(r244079)
+++ head/sys/kern/subr_param.c	Mon Dec 10 12:19:03 2012	(r244080)
@@ -332,8 +332,8 @@ init_param2(long physpages)
 	 * available kernel memory (physical or kmem).
 	 * At most it can be 3/4 of available kernel memory.
 	 */
-	realmem = qmin(physpages * PAGE_SIZE,
-			VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS);
+	realmem = qmin((quad_t)physpages * PAGE_SIZE,
+	    VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS);
 	maxmbufmem = realmem / 2;
 	TUNABLE_QUAD_FETCH("kern.maxmbufmem", &maxmbufmem);
 	if (maxmbufmem > (realmem / 4) * 3)