From b195bc00ef8c2ccf8cc744e5ff9470cb08b45d76 Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Wed, 30 Jan 2008 13:34:03 +0100 Subject: [PATCH] x86: unify pageattr_32.c and pageattr_64.c unify the now perfectly identical pageattr_32/64.c files - no code changed. Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner --- arch/x86/mm/Makefile_32 | 2 +- arch/x86/mm/Makefile_64 | 2 +- arch/x86/mm/{pageattr_32.c => pageattr.c} | 0 arch/x86/mm/pageattr_64.c | 284 ---------------------- 4 files changed, 2 insertions(+), 286 deletions(-) rename arch/x86/mm/{pageattr_32.c => pageattr.c} (100%) delete mode 100644 arch/x86/mm/pageattr_64.c diff --git a/arch/x86/mm/Makefile_32 b/arch/x86/mm/Makefile_32 index 1aeba3bf34..424e5a8622 100644 --- a/arch/x86/mm/Makefile_32 +++ b/arch/x86/mm/Makefile_32 @@ -2,7 +2,7 @@ # Makefile for the linux i386-specific parts of the memory manager. # -obj-y := init_32.o pgtable_32.o fault_32.o ioremap_32.o extable.o pageattr_32.o mmap.o +obj-y := init_32.o pgtable_32.o fault_32.o ioremap_32.o extable.o pageattr.o mmap.o obj-$(CONFIG_CPA_DEBUG) += pageattr-test.o obj-$(CONFIG_NUMA) += discontig_32.o diff --git a/arch/x86/mm/Makefile_64 b/arch/x86/mm/Makefile_64 index cb72316763..0435844784 100644 --- a/arch/x86/mm/Makefile_64 +++ b/arch/x86/mm/Makefile_64 @@ -2,7 +2,7 @@ # Makefile for the linux x86_64-specific parts of the memory manager. # -obj-y := init_64.o fault_64.o ioremap_64.o extable.o pageattr_64.o mmap.o +obj-y := init_64.o fault_64.o ioremap_64.o extable.o pageattr.o mmap.o obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o obj-$(CONFIG_NUMA) += numa_64.o obj-$(CONFIG_K8_NUMA) += k8topology_64.o diff --git a/arch/x86/mm/pageattr_32.c b/arch/x86/mm/pageattr.c similarity index 100% rename from arch/x86/mm/pageattr_32.c rename to arch/x86/mm/pageattr.c diff --git a/arch/x86/mm/pageattr_64.c b/arch/x86/mm/pageattr_64.c deleted file mode 100644 index 0246511be9..0000000000 --- a/arch/x86/mm/pageattr_64.c +++ /dev/null @@ -1,284 +0,0 @@ -/* - * Copyright 2002 Andi Kleen, SuSE Labs. - * Thanks to Ben LaHaise for precious feedback. - */ - -#include -#include -#include -#include -#include - -#include -#include -#include -#include -#include - -pte_t *lookup_address(unsigned long address, int *level) -{ - pgd_t *pgd = pgd_offset_k(address); - pud_t *pud; - pmd_t *pmd; - - if (pgd_none(*pgd)) - return NULL; - pud = pud_offset(pgd, address); - if (pud_none(*pud)) - return NULL; - pmd = pmd_offset(pud, address); - if (pmd_none(*pmd)) - return NULL; - *level = 3; - if (pmd_large(*pmd)) - return (pte_t *)pmd; - *level = 4; - - return pte_offset_kernel(pmd, address); -} - -static void __set_pmd_pte(pte_t *kpte, unsigned long address, pte_t pte) -{ - /* change init_mm */ - set_pte_atomic(kpte, pte); -#ifdef CONFIG_X86_32 - if (SHARED_KERNEL_PMD) - return; - { - struct page *page; - - for (page = pgd_list; page; page = (struct page *)page->index) { - pgd_t *pgd; - pud_t *pud; - pmd_t *pmd; - - pgd = (pgd_t *)page_address(page) + pgd_index(address); - pud = pud_offset(pgd, address); - pmd = pmd_offset(pud, address); - set_pte_atomic((pte_t *)pmd, pte); - } - } -#endif -} - -static int split_large_page(pte_t *kpte, unsigned long address) -{ - pgprot_t ref_prot = pte_pgprot(pte_clrhuge(*kpte)); - gfp_t gfp_flags = GFP_KERNEL; - unsigned long flags; - unsigned long addr; - pte_t *pbase, *tmp; - struct page *base; - int i, level; - - -#ifdef CONFIG_DEBUG_PAGEALLOC - gfp_flags = GFP_ATOMIC; -#endif - base = alloc_pages(gfp_flags, 0); - if (!base) - return -ENOMEM; - - spin_lock_irqsave(&pgd_lock, flags); - /* - * Check for races, another CPU might have split this page - * up for us already: - */ - tmp = lookup_address(address, &level); - if (tmp != kpte) { - WARN_ON_ONCE(1); - goto out_unlock; - } - - address = __pa(address); - addr = address & LARGE_PAGE_MASK; - pbase = (pte_t *)page_address(base); -#ifdef CONFIG_X86_32 - paravirt_alloc_pt(&init_mm, page_to_pfn(base)); -#endif - - for (i = 0; i < PTRS_PER_PTE; i++, addr += PAGE_SIZE) - set_pte(&pbase[i], pfn_pte(addr >> PAGE_SHIFT, ref_prot)); - - /* - * Install the new, split up pagetable: - */ - __set_pmd_pte(kpte, address, mk_pte(base, ref_prot)); - base = NULL; - -out_unlock: - spin_unlock_irqrestore(&pgd_lock, flags); - - if (base) - __free_pages(base, 0); - - return 0; -} - -static int -__change_page_attr(unsigned long address, struct page *page, pgprot_t prot) -{ - struct page *kpte_page; - int level, err = 0; - pte_t *kpte; - - BUG_ON(PageHighMem(page)); - -repeat: - kpte = lookup_address(address, &level); - if (!kpte) - return -EINVAL; - - kpte_page = virt_to_page(kpte); - BUG_ON(PageLRU(kpte_page)); - BUG_ON(PageCompound(kpte_page)); - - /* - * Better fail early if someone sets the kernel text to NX. - * Does not cover __inittext - */ - BUG_ON(address >= (unsigned long)&_text && - address < (unsigned long)&_etext && - (pgprot_val(prot) & _PAGE_NX)); - - if (level == 4) { - set_pte_atomic(kpte, mk_pte(page, canon_pgprot(prot))); - } else { - err = split_large_page(kpte, address); - if (!err) - goto repeat; - } - return err; -} - -/** - * change_page_attr_addr - Change page table attributes in linear mapping - * @address: Virtual address in linear mapping. - * @numpages: Number of pages to change - * @prot: New page table attribute (PAGE_*) - * - * Change page attributes of a page in the direct mapping. This is a variant - * of change_page_attr() that also works on memory holes that do not have - * mem_map entry (pfn_valid() is false). - * - * See change_page_attr() documentation for more details. - */ - -int change_page_attr_addr(unsigned long address, int numpages, pgprot_t prot) -{ - int err = 0, kernel_map = 0, i; - -#ifdef CONFIG_X86_64 - if (address >= __START_KERNEL_map && - address < __START_KERNEL_map + KERNEL_TEXT_SIZE) { - - address = (unsigned long)__va(__pa(address)); - kernel_map = 1; - } -#endif - - for (i = 0; i < numpages; i++, address += PAGE_SIZE) { - unsigned long pfn = __pa(address) >> PAGE_SHIFT; - - if (!kernel_map || pte_present(pfn_pte(0, prot))) { - err = __change_page_attr(address, pfn_to_page(pfn), prot); - if (err) - break; - } -#ifdef CONFIG_X86_64 - /* - * Handle kernel mapping too which aliases part of - * lowmem: - */ - if (__pa(address) < KERNEL_TEXT_SIZE) { - unsigned long addr2; - pgprot_t prot2; - - addr2 = __START_KERNEL_map + __pa(address); - /* Make sure the kernel mappings stay executable */ - prot2 = pte_pgprot(pte_mkexec(pfn_pte(0, prot))); - err = __change_page_attr(addr2, pfn_to_page(pfn), prot2); - } -#endif - } - - return err; -} - -/** - * change_page_attr - Change page table attributes in the linear mapping. - * @page: First page to change - * @numpages: Number of pages to change - * @prot: New protection/caching type (PAGE_*) - * - * Returns 0 on success, otherwise a negated errno. - * - * This should be used when a page is mapped with a different caching policy - * than write-back somewhere - some CPUs do not like it when mappings with - * different caching policies exist. This changes the page attributes of the - * in kernel linear mapping too. - * - * Caller must call global_flush_tlb() later to make the changes active. - * - * The caller needs to ensure that there are no conflicting mappings elsewhere - * (e.g. in user space) * This function only deals with the kernel linear map. - * - * For MMIO areas without mem_map use change_page_attr_addr() instead. - */ -int change_page_attr(struct page *page, int numpages, pgprot_t prot) -{ - unsigned long addr = (unsigned long)page_address(page); - - return change_page_attr_addr(addr, numpages, prot); -} -EXPORT_SYMBOL(change_page_attr); - -static void flush_kernel_map(void *arg) -{ - /* - * Flush all to work around Errata in early athlons regarding - * large page flushing. - */ - __flush_tlb_all(); - - if (boot_cpu_data.x86_model >= 4) - wbinvd(); -} - -void global_flush_tlb(void) -{ - BUG_ON(irqs_disabled()); - - on_each_cpu(flush_kernel_map, NULL, 1, 1); -} -EXPORT_SYMBOL(global_flush_tlb); - -#ifdef CONFIG_DEBUG_PAGEALLOC -void kernel_map_pages(struct page *page, int numpages, int enable) -{ - if (PageHighMem(page)) - return; - if (!enable) { - debug_check_no_locks_freed(page_address(page), - numpages * PAGE_SIZE); - } - - /* - * If page allocator is not up yet then do not call c_p_a(): - */ - if (!debug_pagealloc_enabled) - return; - - /* - * the return value is ignored - the calls cannot fail, - * large pages are disabled at boot time. - */ - change_page_attr(page, numpages, enable ? PAGE_KERNEL : __pgprot(0)); - - /* - * we should perform an IPI and flush all tlbs, - * but that can deadlock->flush only current cpu. - */ - __flush_tlb_all(); -} -#endif -- 2.39.5