Messages in this thread Patch in this message | | | From | Yinghai Lu <> | Subject | [PATCH 1/7] x86, mm: align start address to correct big page size | Date | Tue, 9 Oct 2012 16:58:29 -0700 |
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We are going to use buffer in BRK to pre-map final page table buffer.
Final page table buffer could be only page aligened, but around it are still ram, we could use bigger page to map it to avoid small page.
We will probe to adjust page_size_mask in next patch to make big page size could be used with small ram range.
Before that, this patch will make start address to be aligned down according to bigger page size. otherwise entry in page page will not have correct value.
Signed-off-by: Yinghai Lu <yinghai@kernel.org> --- arch/x86/mm/init_32.c | 1 + arch/x86/mm/init_64.c | 5 +++-- 2 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c index 11a5800..27f7fc6 100644 --- a/arch/x86/mm/init_32.c +++ b/arch/x86/mm/init_32.c @@ -310,6 +310,7 @@ repeat: __pgprot(PTE_IDENT_ATTR | _PAGE_PSE); + pfn &= PMD_MASK >> PAGE_SHIFT; addr2 = (pfn + PTRS_PER_PTE-1) * PAGE_SIZE + PAGE_OFFSET + PAGE_SIZE-1; diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index ab558eb..f40f383 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -461,7 +461,7 @@ phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end, pages++; spin_lock(&init_mm.page_table_lock); set_pte((pte_t *)pmd, - pfn_pte(address >> PAGE_SHIFT, + pfn_pte((address & PMD_MASK) >> PAGE_SHIFT, __pgprot(pgprot_val(prot) | _PAGE_PSE))); spin_unlock(&init_mm.page_table_lock); last_map_addr = next; @@ -536,7 +536,8 @@ phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end, pages++; spin_lock(&init_mm.page_table_lock); set_pte((pte_t *)pud, - pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL_LARGE)); + pfn_pte((addr & PUD_MASK) >> PAGE_SHIFT, + PAGE_KERNEL_LARGE)); spin_unlock(&init_mm.page_table_lock); last_map_addr = next; continue; -- 1.7.7
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