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 <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

4 files changed, 2 insertions, 286 deletions

diff --git a/arch/x86/mm/Makefile_32 b/arch/x86/mm/Makefile_32
index 1aeba3bf34bd..424e5a862271 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 cb723167631b..043584478457 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
index 251613449dd6..251613449dd6 100644
--- a/arch/x86/mm/pageattr_32.c
+++ b/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 0246511be99d..000000000000
--- 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 <linux/highmem.h>
-#include <linux/module.h>
-#include <linux/sched.h>
-#include <linux/slab.h>
-#include <linux/mm.h>
-
-#include <asm/processor.h>
-#include <asm/tlbflush.h>
-#include <asm/sections.h>
-#include <asm/uaccess.h>
-#include <asm/pgalloc.h>
-
-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