1 files changed, 81 insertions, 62 deletions

diff --git a/arch/x86/mm/pageattr_64.c b/arch/x86/mm/pageattr_64.c
index c40afbaaf93..14ab327cde0 100644
--- a/arch/x86/mm/pageattr_64.c
+++ b/arch/x86/mm/pageattr_64.c
@@ -1,48 +1,54 @@
-/* 
- * Copyright 2002 Andi Kleen, SuSE Labs. 
+/*
+ * 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/sched.h>
 #include <linux/slab.h>
-#include <asm/uaccess.h>
+#include <linux/mm.h>
+
 #include <asm/processor.h>
 #include <asm/tlbflush.h>
+#include <asm/uaccess.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; 
+		return NULL;
 	pmd = pmd_offset(pud, address);
 	if (!pmd_present(*pmd))
-		return NULL; 
+		return NULL;
 	if (pmd_large(*pmd))
 		return (pte_t *)pmd;
+
 	pte = pte_offset_kernel(pmd, address);
 	if (pte && !pte_present(*pte))
-		pte = NULL; 
+		pte = NULL;
+
 	return pte;
-} 
+}
 
-static struct page *split_large_page(unsigned long address, pgprot_t prot,
-				     pgprot_t ref_prot)
-{ 
-	int i; 
+static struct page *
+split_large_page(unsigned long address, pgprot_t prot, pgprot_t ref_prot)
+{
 	unsigned long addr;
-	struct page *base = alloc_pages(GFP_KERNEL, 0);
+	struct page *base;
 	pte_t *pbase;
-	if (!base) 
+	int i;
+
+	base = alloc_pages(GFP_KERNEL, 0);
+	if (!base)
 		return NULL;
 	/*
 	 * page_private is used to track the number of entries in
@@ -52,20 +58,21 @@ static struct page *split_large_page(unsigned long address, pgprot_t prot,
 	page_private(base) = 0;
 
 	address = __pa(address);
-	addr = address & LARGE_PAGE_MASK; 
+	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, 
+		pbase[i] = pfn_pte(addr >> PAGE_SHIFT,
 				   addr == address ? prot : ref_prot);
 	}
 	return base;
-} 
+}
 
-void clflush_cache_range(void *adr, int size)
+void clflush_cache_range(void *addr, int size)
 {
 	int i;
+
 	for (i = 0; i < size; i += boot_cpu_data.x86_clflush_size)
-		clflush(adr+i);
+		clflush(addr+i);
 }
 
 static void flush_kernel_map(void *arg)
@@ -76,17 +83,20 @@ static void flush_kernel_map(void *arg)
 	/* 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)
+	if (1 || !cpu_has_clflush) {
 		asm volatile("wbinvd" ::: "memory");
-	else list_for_each_entry(pg, l, lru) {
-		void *adr = page_address(pg);
-		clflush_cache_range(adr, PAGE_SIZE);
+	} else {
+		list_for_each_entry(pg, l, lru) {
+			void *addr = page_address(pg);
+
+			clflush_cache_range(addr, PAGE_SIZE);
+		}
 	}
 	__flush_tlb_all();
 }
 
 static inline void flush_map(struct list_head *l)
-{	
+{
 	on_each_cpu(flush_kernel_map, l, 1, 1);
 }
 
@@ -98,52 +108,56 @@ static inline void save_page(struct page *fpage)
 		list_add(&fpage->lru, &deferred_pages);
 }
 
-/* 
+/*
  * No more special protections in this 2/4MB area - revert to a
- * large page again. 
+ * large page again.
  */
 static void revert_page(unsigned long address, pgprot_t ref_prot)
 {
+	unsigned long pfn;
 	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);
+	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; 
+		   pgprot_t ref_prot)
+{
 	struct page *kpte_page;
 	pgprot_t ref_prot2;
+	pte_t *kpte;
 
 	kpte = lookup_address(address);
-	if (!kpte) return 0;
+	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 (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)
@@ -153,21 +167,23 @@ __change_page_attr(unsigned long address, unsigned long pfn, pgprot_t prot,
 			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();
+	} 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));
+	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.
@@ -176,19 +192,19 @@ __change_page_attr(unsigned long address, unsigned long pfn, pgprot_t prot,
  * 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; 
+	int err = 0, kernel_map = 0, i;
+
+	if (address >= __START_KERNEL_map &&
+			address < __START_KERNEL_map + KERNEL_TEXT_SIZE) {
 
-	if (address >= __START_KERNEL_map
-	    && address < __START_KERNEL_map + KERNEL_TEXT_SIZE) {
 		address = (unsigned long)__va(__pa(address));
 		kernel_map = 1;
 	}
@@ -198,7 +214,8 @@ int change_page_attr_addr(unsigned long address, int numpages, pgprot_t prot)
 		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);
+			err = __change_page_attr(address, pfn, prot,
+						PAGE_KERNEL);
 			if (err)
 				break;
 		}
@@ -207,14 +224,16 @@ int change_page_attr_addr(unsigned long address, int numpages, pgprot_t prot)
 		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); 
+		}
+	}
+	up_write(&init_mm.mmap_sem);
+
 	return err;
 }
 
@@ -222,11 +241,13 @@ int change_page_attr_addr(unsigned long address, int numpages, pgprot_t prot)
 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);
 
 void global_flush_tlb(void)
-{ 
+{
 	struct page *pg, *next;
 	struct list_head l;
 
@@ -248,8 +269,6 @@ void global_flush_tlb(void)
 			continue;
 		ClearPagePrivate(pg);
 		__free_page(pg);
-	} 
-} 
-
-EXPORT_SYMBOL(change_page_attr);
+	}
+}
 EXPORT_SYMBOL(global_flush_tlb);