--- a/debugfs.c
+++ b/debugfs.c
@@ -87,7 +87,6 @@ static void core_dump_file(u8 *valbuf, u
 			   u32 append, u32 totallen, bool textmode)
 {
 	struct file *filp_core = NULL;
-	mm_segment_t oldfs;
 	char file_name[40];
 	u8 *buf = kmalloc(length * 3, GFP_KERNEL);
 	u8 *data_p = buf;
@@ -100,9 +99,6 @@ static void core_dump_file(u8 *valbuf, u
 	sprintf(file_name, "/dev/shm/coredump-%x-%x",
 		region, (region + totallen));
 
-	oldfs = get_fs();
-	set_fs(KERNEL_DS);
-
 	if (append)
 		filp_core = filp_open(file_name, O_RDWR | O_APPEND, 0);
 	else
@@ -125,15 +121,15 @@ static void core_dump_file(u8 *valbuf, u
 			}
 			data_p = buf + j;
 			data_p += sprintf(data_p, "\n");
-			vfs_write(filp_core, buf, strlen(buf),
-				  &filp_core->f_pos);
+			kernel_write(filp_core, buf, strlen(buf),
+				     &filp_core->f_pos);
 		} else
-			vfs_write(filp_core, valbuf, length, &filp_core->f_pos);
+			kernel_write(filp_core, valbuf, length,
+				     &filp_core->f_pos);
 
 		filp_close(filp_core, current->files);
 	}
 
-	set_fs(oldfs);
 	kfree(buf);
 }