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powerpc/mm: define TOP_ZONE as a constant

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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>
This commit is contained in:
Oliver O'Halloran 2016-05-05 17:54:08 +10:00 committed by Michael Ellerman
parent 6670783606
commit dd0b52c47a
1 changed files with 5 additions and 12 deletions
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17
arch/powerpc/mm/mem.c
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@ -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);