1 files changed, 11 insertions, 23 deletions

diff --git a/arch/x86/kernel/kdebugfs.c b/arch/x86/kernel/kdebugfs.c
index 38b64587b31b..fd6f8fbbe6f2 100644
--- a/arch/x86/kernel/kdebugfs.c
+++ b/arch/x86/kernel/kdebugfs.c
@@ -33,7 +33,6 @@ static ssize_t setup_data_read(struct file *file, char __user *user_buf,
 	struct setup_data_node *node = file->private_data;
 	unsigned long remain;
 	loff_t pos = *ppos;
-	struct page *pg;
 	void *p;
 	u64 pa;
 
@@ -47,18 +46,13 @@ static ssize_t setup_data_read(struct file *file, char __user *user_buf,
 		count = node->len - pos;
 
 	pa = node->paddr + sizeof(struct setup_data) + pos;
-	pg = pfn_to_page((pa + count - 1) >> PAGE_SHIFT);
-	if (PageHighMem(pg)) {
-		p = ioremap_cache(pa, count);
-		if (!p)
-			return -ENXIO;
-	} else
-		p = __va(pa);
+	p = memremap(pa, count, MEMREMAP_WB);
+	if (!p)
+		return -ENOMEM;
 
 	remain = copy_to_user(user_buf, p, count);
 
-	if (PageHighMem(pg))
-		iounmap(p);
+	memunmap(p);
 
 	if (remain)
 		return -EFAULT;
@@ -109,7 +103,6 @@ static int __init create_setup_data_nodes(struct dentry *parent)
 	struct setup_data *data;
 	int error;
 	struct dentry *d;
-	struct page *pg;
 	u64 pa_data;
 	int no = 0;
 
@@ -126,16 +119,12 @@ static int __init create_setup_data_nodes(struct dentry *parent)
 			goto err_dir;
 		}
 
-		pg = pfn_to_page((pa_data+sizeof(*data)-1) >> PAGE_SHIFT);
-		if (PageHighMem(pg)) {
-			data = ioremap_cache(pa_data, sizeof(*data));
-			if (!data) {
-				kfree(node);
-				error = -ENXIO;
-				goto err_dir;
-			}
-		} else
-			data = __va(pa_data);
+		data = memremap(pa_data, sizeof(*data), MEMREMAP_WB);
+		if (!data) {
+			kfree(node);
+			error = -ENOMEM;
+			goto err_dir;
+		}
 
 		node->paddr = pa_data;
 		node->type = data->type;
@@ -143,8 +132,7 @@ static int __init create_setup_data_nodes(struct dentry *parent)
 		error = create_setup_data_node(d, no, node);
 		pa_data = data->next;
 
-		if (PageHighMem(pg))
-			iounmap(data);
+		memunmap(data);
 		if (error)
 			goto err_dir;
 		no++;