xen: drop all the special iomap pte paths.

Xen can work out when we're doing IO mappings for itself, so we don't
need to do anything special, and the extra tests just clog things up.
Signed-off-by: NJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>

arch/x86/xen/mmu.c

@@ -243,11 +243,6 @@ static bool xen_page_pinned(void *ptr)
 	return PagePinned(page);
 }
 
-static bool xen_iomap_pte(pte_t pte)
-{
-	return pte_flags(pte) & _PAGE_IOMAP;
-}
-
 void xen_set_domain_pte(pte_t *ptep, pte_t pteval, unsigned domid)
 {
 	struct multicall_space mcs;
@@ -266,11 +261,6 @@ void xen_set_domain_pte(pte_t *ptep, pte_t pteval, unsigned domid)
 }
 EXPORT_SYMBOL_GPL(xen_set_domain_pte);
 
-static void xen_set_iomap_pte(pte_t *ptep, pte_t pteval)
-{
-	xen_set_domain_pte(ptep, pteval, DOMID_IO);
-}
-
 static void xen_extend_mmu_update(const struct mmu_update *update)
 {
 	struct multicall_space mcs;
@@ -347,11 +337,6 @@ void set_pte_mfn(unsigned long vaddr, unsigned long mfn, pgprot_t flags)
 void xen_set_pte_at(struct mm_struct *mm, unsigned long addr,
 		    pte_t *ptep, pte_t pteval)
 {
-	if (xen_iomap_pte(pteval)) {
-		xen_set_iomap_pte(ptep, pteval);
-		goto out;
-	}
-
 	ADD_STATS(set_pte_at, 1);
 //	ADD_STATS(set_pte_at_pinned, xen_page_pinned(ptep));
 	ADD_STATS(set_pte_at_current, mm == current->mm);
@@ -632,11 +617,6 @@ void xen_set_pud(pud_t *ptr, pud_t val)
 
 void xen_set_pte(pte_t *ptep, pte_t pte)
 {
-	if (xen_iomap_pte(pte)) {
-		xen_set_iomap_pte(ptep, pte);
-		return;
-	}
-
 	ADD_STATS(pte_update, 1);
 //	ADD_STATS(pte_update_pinned, xen_page_pinned(ptep));
 	ADD_STATS(pte_update_batched, paravirt_get_lazy_mode() == PARAVIRT_LAZY_MMU);
@@ -653,11 +633,6 @@ void xen_set_pte(pte_t *ptep, pte_t pte)
 #ifdef CONFIG_X86_PAE
 void xen_set_pte_atomic(pte_t *ptep, pte_t pte)
 {
-	if (xen_iomap_pte(pte)) {
-		xen_set_iomap_pte(ptep, pte);
-		return;
-	}
-
 	set_64bit((u64 *)ptep, native_pte_val(pte));
 }