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Subject[PATCH 23/46] x86, mm: Remove parameter in alloc_low_page for 64bit
Date
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>
---
arch/x86/mm/init_64.c | 19 +++++++------------
1 files changed, 7 insertions(+), 12 deletions(-)

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 5ee9242..1960820 100644
--- 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;
}
--
1.7.7


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