On Sat, Oct 06, 2012 at 12:44:29AM -0700, Yinghai Lu wrote:
> Not needed anymore after premaping page table buf and not clear initial page
> table wrongly.
Your comment should include what patch made the iomap/iounmap part
unnecessary.
.. and also explain how this work-around is not required anymore.
>
> Signed-off-by: Yinghai Lu <ying...@kernel.org>
> ---
> arch/x86/mm/init_64.c | 38 ++++----------------------------------
> 1 files changed, 4 insertions(+), 34 deletions(-)
>
> diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
> index 0348a02..e59c94f 100644
> --- a/arch/x86/mm/init_64.c
> +++ b/arch/x86/mm/init_64.c
> @@ -333,36 +333,12 @@ static __ref void *alloc_low_page(unsigned long *phys)
> else
> panic("alloc_low_page: ran out of memory");
>
> - adr = early_memremap(pfn * PAGE_SIZE, PAGE_SIZE);
> + adr = __va(pfn * PAGE_SIZE);
> clear_page(adr);
> *phys = pfn * PAGE_SIZE;
> return adr;
> }
>
> -static __ref void *map_low_page(void *virt)
> -{
> - void *adr;
> - unsigned long phys, left;
> -
> - if (after_bootmem)
> - return virt;
> -
> - phys = __pa(virt);
> - left = phys & (PAGE_SIZE - 1);
> - adr = early_memremap(phys & PAGE_MASK, PAGE_SIZE);
> - adr = (void *)(((unsigned long)adr) | left);
> -
> - return adr;
> -}
> -
> -static __ref void unmap_low_page(void *adr)
> -{
> - if (after_bootmem)
> - return;
> -
> - early_iounmap((void *)((unsigned long)adr & PAGE_MASK), PAGE_SIZE);
> -}
> -
> static unsigned long __meminit
> phys_pte_init(pte_t *pte_page, unsigned long addr, unsigned long end,
> pgprot_t prot)
> @@ -435,10 +411,9 @@ phys_pmd_init(pmd_t *pmd_page, unsigned long address,
> unsigned long end,
> if (pmd_val(*pmd)) {
> if (!pmd_large(*pmd)) {
> spin_lock(&init_mm.page_table_lock);
> - pte = map_low_page((pte_t
> *)pmd_page_vaddr(*pmd));
> + pte = (pte_t *)pmd_page_vaddr(*pmd);
> last_map_addr = phys_pte_init(pte, address,
> end, prot);
> - unmap_low_page(pte);
> spin_unlock(&init_mm.page_table_lock);
> continue;
> }
> @@ -474,7 +449,6 @@ phys_pmd_init(pmd_t *pmd_page, unsigned long address,
> unsigned long end,
>
> pte = alloc_low_page(&pte_phys);
> last_map_addr = phys_pte_init(pte, address, end, new_prot);
> - unmap_low_page(pte);
>
> spin_lock(&init_mm.page_table_lock);
> pmd_populate_kernel(&init_mm, pmd, __va(pte_phys));
> @@ -509,10 +483,9 @@ phys_pud_init(pud_t *pud_page, unsigned long addr,
> unsigned long end,
>
> if (pud_val(*pud)) {
> if (!pud_large(*pud)) {
> - pmd = map_low_page(pmd_offset(pud, 0));
> + pmd = pmd_offset(pud, 0);
> last_map_addr = phys_pmd_init(pmd, addr, end,
> page_size_mask, prot);
> - unmap_low_page(pmd);
> __flush_tlb_all();
> continue;
> }
> @@ -548,7 +521,6 @@ phys_pud_init(pud_t *pud_page, unsigned long addr,
> unsigned long end,
> pmd = alloc_low_page(&pmd_phys);
> last_map_addr = phys_pmd_init(pmd, addr, end, page_size_mask,
> prot);
> - unmap_low_page(pmd);
>
> spin_lock(&init_mm.page_table_lock);
> pud_populate(&init_mm, pud, __va(pmd_phys));
> @@ -584,17 +556,15 @@ kernel_physical_mapping_init(unsigned long start,
> next = end;
>
> if (pgd_val(*pgd)) {
> - pud = map_low_page((pud_t *)pgd_page_vaddr(*pgd));
> + pud = (pud_t *)pgd_page_vaddr(*pgd);
> last_map_addr = phys_pud_init(pud, __pa(start),
> __pa(end), page_size_mask);
> - unmap_low_page(pud);
> continue;
> }
>
> pud = alloc_low_page(&pud_phys);
> last_map_addr = phys_pud_init(pud, __pa(start), __pa(next),
> page_size_mask);
> - unmap_low_page(pud);
>
> spin_lock(&init_mm.page_table_lock);
> pgd_populate(&init_mm, pgd, __va(pud_phys));
> --
> 1.7.7
>
> --
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