x86/paging: Use ROUNUP() to compute the number of initial slots

src/system/kernel/arch/x86/paging/32bit/X86PagingMethod32Bit.cpp

@@ -38,7 +38,7 @@
 
 
 #define MAX_INITIAL_POOLS	\
-	((SMP_MAX_CPUS * TOTAL_SLOTS_PER_CPU + EXTRA_SLOTS + 1023) / 1024)
+	(ROUNDUP(SMP_MAX_CPUS * TOTAL_SLOTS_PER_CPU + EXTRA_SLOTS, 1024) / 1024)
 
 
 using X86LargePhysicalPageMapper::PhysicalPageSlot;

src/system/kernel/arch/x86/paging/pae/X86PagingMethodPAE.cpp

@@ -42,8 +42,9 @@
 
 
 #define MAX_INITIAL_POOLS	\
-	((SMP_MAX_CPUS * TOTAL_SLOTS_PER_CPU + EXTRA_SLOTS	\
+	(ROUNDUP(SMP_MAX_CPUS * TOTAL_SLOTS_PER_CPU + EXTRA_SLOTS,	\
-			+ kPAEPageTableEntryCount - 1) / kPAEPageTableEntryCount)
+			kPAEPageTableEntryCount)	\
+		/ kPAEPageTableEntryCount)
 
 
 using X86LargePhysicalPageMapper::PhysicalPageSlot;