Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=4ec0f73f27cbcf728311d8da7994477c1bd4edbb
Commit:     4ec0f73f27cbcf728311d8da7994477c1bd4edbb
Parent:     5140b4f77d75debc47ccb9b77e00d2e1c68e1a3e
Author:     Thomas Gleixner <[EMAIL PROTECTED]>
AuthorDate: Thu Oct 11 11:16:18 2007 +0200
Committer:  Thomas Gleixner <[EMAIL PROTECTED]>
CommitDate: Thu Oct 11 11:16:18 2007 +0200

    x86_64: prepare shared mm/pageattr.c
    
    Signed-off-by: Thomas Gleixner <[EMAIL PROTECTED]>
    Signed-off-by: Ingo Molnar <[EMAIL PROTECTED]>
---
 arch/x86_64/mm/Makefile      |    2 +-
 arch/x86_64/mm/pageattr.c    |  249 ------------------------------------------
 arch/x86_64/mm/pageattr_64.c |  249 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 250 insertions(+), 250 deletions(-)

diff --git a/arch/x86_64/mm/Makefile b/arch/x86_64/mm/Makefile
index d44c092..019f589 100644
--- a/arch/x86_64/mm/Makefile
+++ b/arch/x86_64/mm/Makefile
@@ -2,7 +2,7 @@
 # Makefile for the linux x86_64-specific parts of the memory manager.
 #
 
-obj-y   := init_64.o fault.o ioremap_64.o extable_64.o pageattr.o mmap_64.o
+obj-y   := init_64.o fault.o ioremap_64.o extable_64.o pageattr_64.o mmap_64.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_64/mm/pageattr.c b/arch/x86_64/mm/pageattr.c
deleted file mode 100644
index 10b9809..0000000
--- a/arch/x86_64/mm/pageattr.c
+++ /dev/null
@@ -1,249 +0,0 @@
-/* 
- * Copyright 2002 Andi Kleen, SuSE Labs. 
- * Thanks to Ben LaHaise for precious feedback.
- */ 
-
-#include <linux/mm.h>
-#include <linux/sched.h>
-#include <linux/highmem.h>
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <asm/uaccess.h>
-#include <asm/processor.h>
-#include <asm/tlbflush.h>
-#include <asm/io.h>
-
-pte_t *lookup_address(unsigned long address)
-{ 
-       pgd_t *pgd = pgd_offset_k(address);
-       pud_t *pud;
-       pmd_t *pmd;
-       pte_t *pte;
-       if (pgd_none(*pgd))
-               return NULL;
-       pud = pud_offset(pgd, address);
-       if (!pud_present(*pud))
-               return NULL; 
-       pmd = pmd_offset(pud, address);
-       if (!pmd_present(*pmd))
-               return NULL; 
-       if (pmd_large(*pmd))
-               return (pte_t *)pmd;
-       pte = pte_offset_kernel(pmd, address);
-       if (pte && !pte_present(*pte))
-               pte = NULL; 
-       return pte;
-} 
-
-static struct page *split_large_page(unsigned long address, pgprot_t prot,
-                                    pgprot_t ref_prot)
-{ 
-       int i; 
-       unsigned long addr;
-       struct page *base = alloc_pages(GFP_KERNEL, 0);
-       pte_t *pbase;
-       if (!base) 
-               return NULL;
-       /*
-        * page_private is used to track the number of entries in
-        * the page table page have non standard attributes.
-        */
-       SetPagePrivate(base);
-       page_private(base) = 0;
-
-       address = __pa(address);
-       addr = address & LARGE_PAGE_MASK; 
-       pbase = (pte_t *)page_address(base);
-       for (i = 0; i < PTRS_PER_PTE; i++, addr += PAGE_SIZE) {
-               pbase[i] = pfn_pte(addr >> PAGE_SHIFT, 
-                                  addr == address ? prot : ref_prot);
-       }
-       return base;
-} 
-
-static void cache_flush_page(void *adr)
-{
-       int i;
-       for (i = 0; i < PAGE_SIZE; i += boot_cpu_data.x86_clflush_size)
-               asm volatile("clflush (%0)" :: "r" (adr + i));
-}
-
-static void flush_kernel_map(void *arg)
-{
-       struct list_head *l = (struct list_head *)arg;
-       struct page *pg;
-
-       /* When clflush is available always use it because it is
-          much cheaper than WBINVD. */
-       /* clflush is still broken. Disable for now. */
-       if (1 || !cpu_has_clflush)
-               asm volatile("wbinvd" ::: "memory");
-       else list_for_each_entry(pg, l, lru) {
-               void *adr = page_address(pg);
-               cache_flush_page(adr);
-       }
-       __flush_tlb_all();
-}
-
-static inline void flush_map(struct list_head *l)
-{      
-       on_each_cpu(flush_kernel_map, l, 1, 1);
-}
-
-static LIST_HEAD(deferred_pages); /* protected by init_mm.mmap_sem */
-
-static inline void save_page(struct page *fpage)
-{
-       if (!test_and_set_bit(PG_arch_1, &fpage->flags))
-               list_add(&fpage->lru, &deferred_pages);
-}
-
-/* 
- * No more special protections in this 2/4MB area - revert to a
- * large page again. 
- */
-static void revert_page(unsigned long address, pgprot_t ref_prot)
-{
-       pgd_t *pgd;
-       pud_t *pud;
-       pmd_t *pmd;
-       pte_t large_pte;
-       unsigned long pfn;
-
-       pgd = pgd_offset_k(address);
-       BUG_ON(pgd_none(*pgd));
-       pud = pud_offset(pgd,address);
-       BUG_ON(pud_none(*pud));
-       pmd = pmd_offset(pud, address);
-       BUG_ON(pmd_val(*pmd) & _PAGE_PSE);
-       pfn = (__pa(address) & LARGE_PAGE_MASK) >> PAGE_SHIFT;
-       large_pte = pfn_pte(pfn, ref_prot);
-       large_pte = pte_mkhuge(large_pte);
-       set_pte((pte_t *)pmd, large_pte);
-}      
-
-static int
-__change_page_attr(unsigned long address, unsigned long pfn, pgprot_t prot,
-                                  pgprot_t ref_prot)
-{ 
-       pte_t *kpte; 
-       struct page *kpte_page;
-       pgprot_t ref_prot2;
-
-       kpte = lookup_address(address);
-       if (!kpte) return 0;
-       kpte_page = virt_to_page(((unsigned long)kpte) & PAGE_MASK);
-       BUG_ON(PageLRU(kpte_page));
-       BUG_ON(PageCompound(kpte_page));
-       if (pgprot_val(prot) != pgprot_val(ref_prot)) { 
-               if (!pte_huge(*kpte)) {
-                       set_pte(kpte, pfn_pte(pfn, prot));
-               } else {
-                       /*
-                        * split_large_page will take the reference for this
-                        * change_page_attr on the split page.
-                        */
-                       struct page *split;
-                       ref_prot2 = pte_pgprot(pte_clrhuge(*kpte));
-                       split = split_large_page(address, prot, ref_prot2);
-                       if (!split)
-                               return -ENOMEM;
-                       set_pte(kpte, mk_pte(split, ref_prot2));
-                       kpte_page = split;
-               }
-               page_private(kpte_page)++;
-       } else if (!pte_huge(*kpte)) {
-               set_pte(kpte, pfn_pte(pfn, ref_prot));
-               BUG_ON(page_private(kpte_page) == 0);
-               page_private(kpte_page)--;
-       } else
-               BUG();
-
-       /* on x86-64 the direct mapping set at boot is not using 4k pages */
-       BUG_ON(PageReserved(kpte_page));
-
-       save_page(kpte_page);
-       if (page_private(kpte_page) == 0)
-               revert_page(address, ref_prot);
-       return 0;
-} 
-
-/*
- * Change the page attributes of an page in the linear mapping.
- *
- * 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.
- * 
- * The caller needs to ensure that there are no conflicting mappings elsewhere.
- * This function only deals with the kernel linear map.
- * 
- * Caller must call global_flush_tlb() after this.
- */
-int change_page_attr_addr(unsigned long address, int numpages, pgprot_t prot)
-{
-       int err = 0, kernel_map = 0;
-       int i; 
-
-       if (address >= __START_KERNEL_map
-           && address < __START_KERNEL_map + KERNEL_TEXT_SIZE) {
-               address = (unsigned long)__va(__pa(address));
-               kernel_map = 1;
-       }
-
-       down_write(&init_mm.mmap_sem);
-       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, prot, 
PAGE_KERNEL);
-                       if (err)
-                               break;
-               }
-               /* Handle kernel mapping too which aliases part of the
-                * 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, prot2,
-                                                PAGE_KERNEL_EXEC);
-               } 
-       }       
-       up_write(&init_mm.mmap_sem); 
-       return err;
-}
-
-/* Don't call this for MMIO areas that may not have a mem_map entry */
-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);
-}
-
-void global_flush_tlb(void)
-{ 
-       struct page *pg, *next;
-       struct list_head l;
-
-       down_read(&init_mm.mmap_sem);
-       list_replace_init(&deferred_pages, &l);
-       up_read(&init_mm.mmap_sem);
-
-       flush_map(&l);
-
-       list_for_each_entry_safe(pg, next, &l, lru) {
-               list_del(&pg->lru);
-               clear_bit(PG_arch_1, &pg->flags);
-               if (page_private(pg) != 0)
-                       continue;
-               ClearPagePrivate(pg);
-               __free_page(pg);
-       } 
-} 
-
-EXPORT_SYMBOL(change_page_attr);
-EXPORT_SYMBOL(global_flush_tlb);
diff --git a/arch/x86_64/mm/pageattr_64.c b/arch/x86_64/mm/pageattr_64.c
new file mode 100644
index 0000000..10b9809
--- /dev/null
+++ b/arch/x86_64/mm/pageattr_64.c
@@ -0,0 +1,249 @@
+/* 
+ * Copyright 2002 Andi Kleen, SuSE Labs. 
+ * Thanks to Ben LaHaise for precious feedback.
+ */ 
+
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <linux/highmem.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <asm/uaccess.h>
+#include <asm/processor.h>
+#include <asm/tlbflush.h>
+#include <asm/io.h>
+
+pte_t *lookup_address(unsigned long address)
+{ 
+       pgd_t *pgd = pgd_offset_k(address);
+       pud_t *pud;
+       pmd_t *pmd;
+       pte_t *pte;
+       if (pgd_none(*pgd))
+               return NULL;
+       pud = pud_offset(pgd, address);
+       if (!pud_present(*pud))
+               return NULL; 
+       pmd = pmd_offset(pud, address);
+       if (!pmd_present(*pmd))
+               return NULL; 
+       if (pmd_large(*pmd))
+               return (pte_t *)pmd;
+       pte = pte_offset_kernel(pmd, address);
+       if (pte && !pte_present(*pte))
+               pte = NULL; 
+       return pte;
+} 
+
+static struct page *split_large_page(unsigned long address, pgprot_t prot,
+                                    pgprot_t ref_prot)
+{ 
+       int i; 
+       unsigned long addr;
+       struct page *base = alloc_pages(GFP_KERNEL, 0);
+       pte_t *pbase;
+       if (!base) 
+               return NULL;
+       /*
+        * page_private is used to track the number of entries in
+        * the page table page have non standard attributes.
+        */
+       SetPagePrivate(base);
+       page_private(base) = 0;
+
+       address = __pa(address);
+       addr = address & LARGE_PAGE_MASK; 
+       pbase = (pte_t *)page_address(base);
+       for (i = 0; i < PTRS_PER_PTE; i++, addr += PAGE_SIZE) {
+               pbase[i] = pfn_pte(addr >> PAGE_SHIFT, 
+                                  addr == address ? prot : ref_prot);
+       }
+       return base;
+} 
+
+static void cache_flush_page(void *adr)
+{
+       int i;
+       for (i = 0; i < PAGE_SIZE; i += boot_cpu_data.x86_clflush_size)
+               asm volatile("clflush (%0)" :: "r" (adr + i));
+}
+
+static void flush_kernel_map(void *arg)
+{
+       struct list_head *l = (struct list_head *)arg;
+       struct page *pg;
+
+       /* When clflush is available always use it because it is
+          much cheaper than WBINVD. */
+       /* clflush is still broken. Disable for now. */
+       if (1 || !cpu_has_clflush)
+               asm volatile("wbinvd" ::: "memory");
+       else list_for_each_entry(pg, l, lru) {
+               void *adr = page_address(pg);
+               cache_flush_page(adr);
+       }
+       __flush_tlb_all();
+}
+
+static inline void flush_map(struct list_head *l)
+{      
+       on_each_cpu(flush_kernel_map, l, 1, 1);
+}
+
+static LIST_HEAD(deferred_pages); /* protected by init_mm.mmap_sem */
+
+static inline void save_page(struct page *fpage)
+{
+       if (!test_and_set_bit(PG_arch_1, &fpage->flags))
+               list_add(&fpage->lru, &deferred_pages);
+}
+
+/* 
+ * No more special protections in this 2/4MB area - revert to a
+ * large page again. 
+ */
+static void revert_page(unsigned long address, pgprot_t ref_prot)
+{
+       pgd_t *pgd;
+       pud_t *pud;
+       pmd_t *pmd;
+       pte_t large_pte;
+       unsigned long pfn;
+
+       pgd = pgd_offset_k(address);
+       BUG_ON(pgd_none(*pgd));
+       pud = pud_offset(pgd,address);
+       BUG_ON(pud_none(*pud));
+       pmd = pmd_offset(pud, address);
+       BUG_ON(pmd_val(*pmd) & _PAGE_PSE);
+       pfn = (__pa(address) & LARGE_PAGE_MASK) >> PAGE_SHIFT;
+       large_pte = pfn_pte(pfn, ref_prot);
+       large_pte = pte_mkhuge(large_pte);
+       set_pte((pte_t *)pmd, large_pte);
+}      
+
+static int
+__change_page_attr(unsigned long address, unsigned long pfn, pgprot_t prot,
+                                  pgprot_t ref_prot)
+{ 
+       pte_t *kpte; 
+       struct page *kpte_page;
+       pgprot_t ref_prot2;
+
+       kpte = lookup_address(address);
+       if (!kpte) return 0;
+       kpte_page = virt_to_page(((unsigned long)kpte) & PAGE_MASK);
+       BUG_ON(PageLRU(kpte_page));
+       BUG_ON(PageCompound(kpte_page));
+       if (pgprot_val(prot) != pgprot_val(ref_prot)) { 
+               if (!pte_huge(*kpte)) {
+                       set_pte(kpte, pfn_pte(pfn, prot));
+               } else {
+                       /*
+                        * split_large_page will take the reference for this
+                        * change_page_attr on the split page.
+                        */
+                       struct page *split;
+                       ref_prot2 = pte_pgprot(pte_clrhuge(*kpte));
+                       split = split_large_page(address, prot, ref_prot2);
+                       if (!split)
+                               return -ENOMEM;
+                       set_pte(kpte, mk_pte(split, ref_prot2));
+                       kpte_page = split;
+               }
+               page_private(kpte_page)++;
+       } else if (!pte_huge(*kpte)) {
+               set_pte(kpte, pfn_pte(pfn, ref_prot));
+               BUG_ON(page_private(kpte_page) == 0);
+               page_private(kpte_page)--;
+       } else
+               BUG();
+
+       /* on x86-64 the direct mapping set at boot is not using 4k pages */
+       BUG_ON(PageReserved(kpte_page));
+
+       save_page(kpte_page);
+       if (page_private(kpte_page) == 0)
+               revert_page(address, ref_prot);
+       return 0;
+} 
+
+/*
+ * Change the page attributes of an page in the linear mapping.
+ *
+ * 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.
+ * 
+ * The caller needs to ensure that there are no conflicting mappings elsewhere.
+ * This function only deals with the kernel linear map.
+ * 
+ * Caller must call global_flush_tlb() after this.
+ */
+int change_page_attr_addr(unsigned long address, int numpages, pgprot_t prot)
+{
+       int err = 0, kernel_map = 0;
+       int i; 
+
+       if (address >= __START_KERNEL_map
+           && address < __START_KERNEL_map + KERNEL_TEXT_SIZE) {
+               address = (unsigned long)__va(__pa(address));
+               kernel_map = 1;
+       }
+
+       down_write(&init_mm.mmap_sem);
+       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, prot, 
PAGE_KERNEL);
+                       if (err)
+                               break;
+               }
+               /* Handle kernel mapping too which aliases part of the
+                * 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, prot2,
+                                                PAGE_KERNEL_EXEC);
+               } 
+       }       
+       up_write(&init_mm.mmap_sem); 
+       return err;
+}
+
+/* Don't call this for MMIO areas that may not have a mem_map entry */
+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);
+}
+
+void global_flush_tlb(void)
+{ 
+       struct page *pg, *next;
+       struct list_head l;
+
+       down_read(&init_mm.mmap_sem);
+       list_replace_init(&deferred_pages, &l);
+       up_read(&init_mm.mmap_sem);
+
+       flush_map(&l);
+
+       list_for_each_entry_safe(pg, next, &l, lru) {
+               list_del(&pg->lru);
+               clear_bit(PG_arch_1, &pg->flags);
+               if (page_private(pg) != 0)
+                       continue;
+               ClearPagePrivate(pg);
+               __free_page(pg);
+       } 
+} 
+
+EXPORT_SYMBOL(change_page_attr);
+EXPORT_SYMBOL(global_flush_tlb);
-
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