x86: sparse warnings in pageattr.c

Adjust the definition of lookup_address to take an unsigned long
level argument. Adjust callers in xen/mmu.c that pass in a
dummy variable.

Signed-off-by: Harvey Harrison <[e-mail]>
Signed-off-by: Ingo Molnar <[e-mail]>
Signed-off-by: Thomas Gleixner <[e-mail]>

arch/x86/mm/pageattr.c

···
  * or when the present bit is not set. Otherwise we would return a
  * pointer to a nonexisting mapping.
  */
-pte_t *lookup_address(unsigned long address, int *level)
+pte_t *lookup_address(unsigned long address, unsigned int *level)
 {
 	pgd_t *pgd = pgd_offset_k(address);
 	pud_t *pud;
···
 	unsigned long nextpage_addr, numpages, pmask, psize, flags;
 	pte_t new_pte, old_pte, *tmp;
 	pgprot_t old_prot, new_prot;
-	int level, do_split = 1;
+	int do_split = 1;
+	unsigned int level;
 
 	spin_lock_irqsave(&pgd_lock, flags);
 	/*
···
 
 static int __change_page_attr(unsigned long address, struct cpa_data *cpa)
 {
-	int level, do_split, err;
+	int do_split, err;
+	unsigned int level;
 	struct page *kpte_page;
 	pte_t *kpte;
 

arch/x86/xen/mmu.c

···
 
 xmaddr_t arbitrary_virt_to_machine(unsigned long address)
 {
-	int level;
+	unsigned int level;
 	pte_t *pte = lookup_address(address, &level);
 	unsigned offset = address & PAGE_MASK;
 
···
 {
 	pte_t *pte, ptev;
 	unsigned long address = (unsigned long)vaddr;
-	int level;
+	unsigned int level;
 
 	pte = lookup_address(address, &level);
 	BUG_ON(pte == NULL);
···
 {
 	pte_t *pte, ptev;
 	unsigned long address = (unsigned long)vaddr;
-	int level;
+	unsigned int level;
 
 	pte = lookup_address(address, &level);
 	BUG_ON(pte == NULL);

include/asm-x86/pgtable.h

···
  * NOTE: the return type is pte_t but if the pmd is PSE then we return it
  * as a pte too.
  */
-extern pte_t *lookup_address(unsigned long address, int *level);
+extern pte_t *lookup_address(unsigned long address, unsigned int *level);
 
 /* local pte updates need not use xchg for locking */
 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)