[ARM] Update ARM memory region reservations.

Remove 26-bit ARM region reserves.

All region reserves start at PHYS_OFFSET, and we only ever have one,
so set res_size and reserve the region from PHYS_OFFSET size res_size.
    
Don't free the .init sections on Integrator/CP - they sit in the SSRAM
obscured region so we are unable to use them for DMA purposes.

arch/arm/mm/init.c

@@ -281,6 +281,7 @@ static int __init check_initrd(struct meminfo *mi)
 static __init void reserve_node_zero(unsigned int bootmap_pfn, unsigned int bootmap_pages)
 {
 	pg_data_t *pgdat = NODE_DATA(0);
+	unsigned long res_size = 0;
 
 	/*
 	 * Register the kernel text and data with bootmem.
@@ -304,31 +305,32 @@ static __init void reserve_node_zero(unsigned int bootmap_pfn, unsigned int boot
 			     bootmap_pages << PAGE_SHIFT);
 
 	/*
-	 * Hmm... This should go elsewhere, but we really really
-	 * need to stop things allocating the low memory; we need
-	 * a better implementation of GFP_DMA which does not assume
-	 * that DMA-able memory starts at zero.
+	 * Hmm... This should go elsewhere, but we really really need to
+	 * stop things allocating the low memory; ideally we need a better
+	 * implementation of GFP_DMA which does not assume that DMA-able
+	 * memory starts at zero.
 	 */
-	if (machine_is_integrator())
-		reserve_bootmem_node(pgdat, 0, __pa(swapper_pg_dir));
+	if (machine_is_integrator() || machine_is_cintegrator())
+		res_size = __pa(swapper_pg_dir) - PHYS_OFFSET;
+
 	/*
-	 * These should likewise go elsewhere.  They pre-reserve
-	 * the screen memory region at the start of main system
-	 * memory.
+	 * These should likewise go elsewhere.  They pre-reserve the
+	 * screen memory region at the start of main system memory.
 	 */
-	if (machine_is_archimedes() || machine_is_a5k())
-		reserve_bootmem_node(pgdat, 0x02000000, 0x00080000);
 	if (machine_is_edb7211())
-		reserve_bootmem_node(pgdat, 0xc0000000, 0x00020000);
+		res_size = 0x00020000;
 	if (machine_is_p720t())
-		reserve_bootmem_node(pgdat, PHYS_OFFSET, 0x00014000);
+		res_size = 0x00014000;
+
 #ifdef CONFIG_SA1111
 	/*
-	 * Because of the SA1111 DMA bug, we want to preserve
-	 * our precious DMA-able memory...
+	 * Because of the SA1111 DMA bug, we want to preserve our
+	 * precious DMA-able memory...
 	 */
-	reserve_bootmem_node(pgdat, PHYS_OFFSET, __pa(swapper_pg_dir)-PHYS_OFFSET);
+	res_size = __pa(swapper_pg_dir) - PHYS_OFFSET;
 #endif
+	if (res_size)
+		reserve_bootmem_node(pgdat, PHYS_OFFSET, res_size);
 }
 
 /*
@@ -601,7 +603,7 @@ void __init mem_init(void)
 
 void free_initmem(void)
 {
-	if (!machine_is_integrator()) {
+	if (!machine_is_integrator() && !machine_is_cintegrator()) {
 		free_area((unsigned long)(&__init_begin),
 			  (unsigned long)(&__init_end),
 			  "init");