x86, mm: Remove parameter in alloc_low_page for 64bit

Now all page table buf are pre-mapped, and could use virtual address directly.
So don't need to remember physical address anymore.

Remove that phys pointer in alloc_low_page(), and that will allow us to merge
alloc_low_page between 64bit and 32bit.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/1353123563-3103-24-git-send-email-yinghai@kernel.org
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 5ee9242..1960820 100644 (file)
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -314,14 +314,13 @@ void __init cleanup_highmap(void)
        }
 }
 
-static __ref void *alloc_low_page(unsigned long *phys)
+static __ref void *alloc_low_page(void)
 {
        unsigned long pfn;
        void *adr;
 
        if (after_bootmem) {
                adr = (void *)get_zeroed_page(GFP_ATOMIC | __GFP_NOTRACK);
-               *phys = __pa(adr);
 
                return adr;
        }
@@ -342,7 +341,6 @@ static __ref void *alloc_low_page(unsigned long *phys)
 
        adr = __va(pfn * PAGE_SIZE);
        clear_page(adr);
-       *phys  = pfn * PAGE_SIZE;
        return adr;
 }
 
@@ -401,7 +399,6 @@ phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end,
        int i = pmd_index(address);
 
        for (; i < PTRS_PER_PMD; i++, address = next) {
-               unsigned long pte_phys;
                pmd_t *pmd = pmd_page + pmd_index(address);
                pte_t *pte;
                pgprot_t new_prot = prot;
@@ -456,11 +453,11 @@ phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end,
                        continue;
                }
 
-               pte = alloc_low_page(&pte_phys);
+               pte = alloc_low_page();
                last_map_addr = phys_pte_init(pte, address, end, new_prot);
 
                spin_lock(&init_mm.page_table_lock);
-               pmd_populate_kernel(&init_mm, pmd, __va(pte_phys));
+               pmd_populate_kernel(&init_mm, pmd, pte);
                spin_unlock(&init_mm.page_table_lock);
        }
        update_page_count(PG_LEVEL_2M, pages);
@@ -476,7 +473,6 @@ phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end,
        int i = pud_index(addr);
 
        for (; i < PTRS_PER_PUD; i++, addr = next) {
-               unsigned long pmd_phys;
                pud_t *pud = pud_page + pud_index(addr);
                pmd_t *pmd;
                pgprot_t prot = PAGE_KERNEL;
@@ -530,12 +526,12 @@ phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end,
                        continue;
                }
 
-               pmd = alloc_low_page(&pmd_phys);
+               pmd = alloc_low_page();
                last_map_addr = phys_pmd_init(pmd, addr, end, page_size_mask,
                                              prot);
 
                spin_lock(&init_mm.page_table_lock);
-               pud_populate(&init_mm, pud, __va(pmd_phys));
+               pud_populate(&init_mm, pud, pmd);
                spin_unlock(&init_mm.page_table_lock);
        }
        __flush_tlb_all();
@@ -560,7 +556,6 @@ kernel_physical_mapping_init(unsigned long start,
 
        for (; start < end; start = next) {
                pgd_t *pgd = pgd_offset_k(start);
-               unsigned long pud_phys;
                pud_t *pud;
 
                next = (start + PGDIR_SIZE) & PGDIR_MASK;
@@ -574,12 +569,12 @@ kernel_physical_mapping_init(unsigned long start,
                        continue;
                }
 
-               pud = alloc_low_page(&pud_phys);
+               pud = alloc_low_page();
                last_map_addr = phys_pud_init(pud, __pa(start), __pa(next),
                                                 page_size_mask);
 
                spin_lock(&init_mm.page_table_lock);
-               pgd_populate(&init_mm, pgd, __va(pud_phys));
+               pgd_populate(&init_mm, pgd, pud);
                spin_unlock(&init_mm.page_table_lock);
                pgd_changed = true;
        }