x86: Fix warning about cast from pointer to integer of different size

This patch fixes a warning reported by the kbuild test robot where we were
casting a pointer to a physical address which represents an integer of a
different size.  Per the suggestion of Peter Anvin I am replacing it and one
other spot where I made a similar cast with an unsigned long.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Link: http://lkml.kernel.org/r/20121119182927.3655.7641.stgit@ahduyck-cp1.jf.intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

arch/x86/kernel/head32.c

@@ -31,7 +31,7 @@ static void __init i386_default_early_setup(void)
 void __init i386_start_kernel(void)
 {
 	memblock_reserve(__pa_symbol(_text),
-			 (phys_addr_t)__bss_stop - (phys_addr_t)_text);
+			 (unsigned long)__bss_stop - (unsigned long)_text);
 
 #ifdef CONFIG_BLK_DEV_INITRD
 	/* Reserve INITRD */

arch/x86/kernel/head64.c

@@ -98,7 +98,7 @@ void __init x86_64_start_reservations(char *real_mode_data)
 	copy_bootdata(__va(real_mode_data));
 
 	memblock_reserve(__pa_symbol(_text),
-			 (phys_addr_t)__bss_stop - (phys_addr_t)_text);
+			 (unsigned long)__bss_stop - (unsigned long)_text);
 
 #ifdef CONFIG_BLK_DEV_INITRD
 	/* Reserve INITRD */