x86: simplify __ioremap

Remove tons of castings which make the code hard to read.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/mm/ioremap.c

@@ -114,9 +114,8 @@ static int ioremap_change_attr(unsigned long paddr, unsigned long size,
 static void __iomem *__ioremap(unsigned long phys_addr, unsigned long size,
 			       enum ioremap_mode mode)
 {
-	void __iomem *addr;
+	unsigned long pfn, offset, last_addr, vaddr;
 	struct vm_struct *area;
-	unsigned long pfn, offset, last_addr;
 	pgprot_t prot;
 
 	/* Don't allow wraparound or zero size */
@@ -164,19 +163,18 @@ static void __iomem *__ioremap(unsigned long phys_addr, unsigned long size,
 	if (!area)
 		return NULL;
 	area->phys_addr = phys_addr;
-	addr = (void __iomem *) area->addr;
-	if (ioremap_page_range((unsigned long)addr, (unsigned long)addr + size,
-			       phys_addr, prot)) {
-		remove_vm_area((void *)(PAGE_MASK & (unsigned long) addr));
+	vaddr = (unsigned long) area->addr;
+	if (ioremap_page_range(vaddr, vaddr + size, phys_addr, prot)) {
+		remove_vm_area((void *)(vaddr & PAGE_MASK));
 		return NULL;
 	}
 
 	if (ioremap_change_attr(phys_addr, size, mode) < 0) {
-		vunmap(addr);
+		vunmap(area->addr);
 		return NULL;
 	}
 
-	return (void __iomem *) (offset + (char __iomem *)addr);
+	return (void __iomem *) (vaddr + offset);
 }
 
 /**