Clean up struct screen_info (<linux/screen_info.h>)

struct screen_info has unaligned members, it needs to be packed.
In the process, fix the naming of some of the members, which don't
belong in this structure but are part of it anyway.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/screen_info.h

@@ -10,7 +10,7 @@
 struct screen_info {
 	u8  orig_x;		/* 0x00 */
 	u8  orig_y;		/* 0x01 */
-	u16 dontuse1;		/* 0x02 -- EXT_MEM_K sits here */
+	u16 ext_mem_k;		/* 0x02 */
 	u16 orig_video_page;	/* 0x04 */
 	u8  orig_video_mode;	/* 0x06 */
 	u8  orig_video_cols;	/* 0x07 */
@@ -27,7 +27,7 @@ struct screen_info {
 	u16 lfb_depth;		/* 0x16 */
 	u32 lfb_base;		/* 0x18 */
 	u32 lfb_size;		/* 0x1c */
-	u16 dontuse2, dontuse3;	/* 0x20 -- CL_MAGIC and CL_OFFSET here */
+	u16 cl_magic, cl_offset; /* 0x20 */
 	u16 lfb_linelength;	/* 0x24 */
 	u8  red_size;		/* 0x26 */
 	u8  red_pos;		/* 0x27 */
@@ -42,9 +42,8 @@ struct screen_info {
 	u16 pages;		/* 0x32 */
 	u16 vesa_attributes;	/* 0x34 */
 	u32 capabilities;       /* 0x36 */
-				/* 0x3a -- 0x3b reserved for future expansion */
-				/* 0x3c -- 0x3f micro stack for relocatable kernels */
-};
+	u8  _reserved[6];	/* 0x3a */
+} __attribute__((packed));
 
 extern struct screen_info screen_info;