[patch 06/11] PAT x86: Refactoring i386 cpa

[venkatesh . pallipadi]

This makes 32 bit cpa similar to x86_64 and makes it easier for following PAT
patches.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@xxxxxxxxx>
Signed-off-by: Suresh Siddha <suresh.b.siddha@xxxxxxxxx>

Index: linux-2.6.git/arch/x86/mm/pageattr_32.c
===================================================================
--- linux-2.6.git.orig/arch/x86/mm/pageattr_32.c	2008-01-08 04:05:24.000000000 -0800
+++ linux-2.6.git/arch/x86/mm/pageattr_32.c	2008-01-08 05:10:44.000000000 -0800
@@ -153,15 +153,12 @@
 		list_add(&kpte_page->lru, &df_list);
 }
 
-static int __change_page_attr(struct page *page, pgprot_t prot)
+static int __change_page_attr(unsigned long address, unsigned long pfn,
+                              pgprot_t prot)
 {
 	struct page *kpte_page;
-	unsigned long address;
 	pte_t *kpte;
 
-	BUG_ON(PageHighMem(page));
-	address = (unsigned long)page_address(page);
-
 	kpte = lookup_address(address);
 	if (!kpte)
 		return -EINVAL;
@@ -172,7 +169,7 @@
 
 	if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL)) {
 		if (!pte_huge(*kpte)) {
-			set_pte_atomic(kpte, mk_pte(page, prot));
+			set_pte_atomic(kpte, pfn_pte(pfn, prot));
 		} else {
 			struct page *split;
 			pgprot_t ref_prot;
@@ -190,7 +187,7 @@
 		page_private(kpte_page)++;
 	} else {
 		if (!pte_huge(*kpte)) {
-			set_pte_atomic(kpte, mk_pte(page, PAGE_KERNEL));
+			set_pte_atomic(kpte, pfn_pte(pfn, PAGE_KERNEL));
 			BUG_ON(page_private(kpte_page) == 0);
 			page_private(kpte_page)--;
 		} else
@@ -231,14 +228,15 @@
  *
  * Caller must call global_flush_tlb() after this.
  */
-int change_page_attr(struct page *page, int numpages, pgprot_t prot)
+int change_page_attr_addr(unsigned long address, int numpages, pgprot_t prot)
 {
 	unsigned long flags;
 	int err = 0, i;
 
 	spin_lock_irqsave(&cpa_lock, flags);
-	for (i = 0; i < numpages; i++, page++) {
-		err = __change_page_attr(page, prot);
+	for (i = 0; i < numpages; i++, address += PAGE_SIZE) {
+		unsigned long pfn = __pa(address) >> PAGE_SHIFT;
+		err = __change_page_attr(address, pfn, prot);
 		if (err)
 			break;
 	}
@@ -248,6 +246,12 @@
 }
 EXPORT_SYMBOL(change_page_attr);
 
+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;

-- 
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