powerpc/mm: define TOP_ZONE as a constant

The zone that contains the top of memory will be either ZONE_NORMAL
or ZONE_HIGHMEM depending on the kernel config. There are two functions
that require this information and both of them use an #ifdef to set
a local variable (top_zone). This is a little silly so lets just make it
a constant.

Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Cc: linux-mm@kvack.org
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 89677884ecc85e35a1f524aec3143d22b8df631e..879e0bc6f82eaddc509f4e8bc9004e52cd0a3124 100644 (file)
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -68,12 +68,15 @@ pte_t *kmap_pte;
 EXPORT_SYMBOL(kmap_pte);
 pgprot_t kmap_prot;
 EXPORT_SYMBOL(kmap_prot);
+#define TOP_ZONE ZONE_HIGHMEM
 
 static inline pte_t *virt_to_kpte(unsigned long vaddr)
 {
        return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr),
                        vaddr), vaddr), vaddr);
 }
+#else
+#define TOP_ZONE ZONE_NORMAL
 #endif
 
 int page_is_ram(unsigned long pfn)
@@ -267,14 +270,9 @@ void __init limit_zone_pfn(enum zone_type zone, unsigned long pfn_limit)
  */
 int dma_pfn_limit_to_zone(u64 pfn_limit)
 {
-       enum zone_type top_zone = ZONE_NORMAL;
        int i;
 
-#ifdef CONFIG_HIGHMEM
-       top_zone = ZONE_HIGHMEM;
-#endif
-
-       for (i = top_zone; i >= 0; i--) {
+       for (i = TOP_ZONE; i >= 0; i--) {
                if (max_zone_pfns[i] <= pfn_limit)
                        return i;
        }
@@ -289,7 +287,6 @@ void __init paging_init(void)
 {
        unsigned long long total_ram = memblock_phys_mem_size();
        phys_addr_t top_of_ram = memblock_end_of_DRAM();
-       enum zone_type top_zone;
 
 #ifdef CONFIG_PPC32
        unsigned long v = __fix_to_virt(__end_of_fixed_addresses - 1);
@@ -313,13 +310,9 @@ void __init paging_init(void)
               (long int)((top_of_ram - total_ram) >> 20));
 
 #ifdef CONFIG_HIGHMEM
-       top_zone = ZONE_HIGHMEM;
        limit_zone_pfn(ZONE_NORMAL, lowmem_end_addr >> PAGE_SHIFT);
-#else
-       top_zone = ZONE_NORMAL;
 #endif
-
-       limit_zone_pfn(top_zone, top_of_ram >> PAGE_SHIFT);
+       limit_zone_pfn(TOP_ZONE, top_of_ram >> PAGE_SHIFT);
        zone_limits_final = true;
        free_area_init_nodes(max_zone_pfns);