CPA: Implement change_page_attr_addr entry point for i386

Similar to 64bit.

Needed by PAT patches. Replaces 5ec5c5a2302ca8794da03f8bedec931a2a814ae9

Note: should probably be put before PAT patches to avoid bisect failures later

Signed-off-by: Andi Kleen <ak@suse.de>

---
 arch/x86/mm/pageattr_32.c |   15 +++++++++++++++
 1 file changed, 15 insertions(+)

Index: linux/arch/x86/mm/pageattr_32.c
===================================================================
--- linux.orig/arch/x86/mm/pageattr_32.c
+++ linux/arch/x86/mm/pageattr_32.c
@@ -233,6 +233,21 @@ int change_page_attr(struct page *page, 
 	return err;
 }
 
+int change_page_attr_addr(unsigned long addr, int numpages, pgprot_t prot)
+{
+	int i;
+	unsigned long pfn = (addr >> PAGE_SHIFT);
+	for (i = 0; i < numpages; i++) {
+		if (!pfn_valid(pfn + i)) {
+			break;
+		} else {
+			pte_t *pte = lookup_address(addr + i*PAGE_SIZE);
+			BUG_ON(pte && !pte_none(*pte));
+		}
+	}
+	return change_page_attr(virt_to_page(addr), i, prot);
+}
+
 void global_flush_tlb(void)
 {
 	struct list_head l;