x86/floppy: Use designated initializers

Prepare to mark sensitive kernel structures for randomization by making
sure they're using designated initializers. These were identified during
allyesconfig builds of x86, arm, and arm64, with most initializer fixes
extracted from grsecurity.
Signed-off-by: NKees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20161217213705.GA1248@beastSigned-off-by: NIngo Molnar <mingo@kernel.org>

arch/x86/include/asm/floppy.h

@@ -229,18 +229,18 @@ static struct fd_routine_l {
 	int (*_dma_setup)(char *addr, unsigned long size, int mode, int io);
 } fd_routine[] = {
 	{
-		request_dma,
-		free_dma,
-		get_dma_residue,
-		dma_mem_alloc,
-		hard_dma_setup
+		._request_dma		= request_dma,
+		._free_dma		= free_dma,
+		._get_dma_residue	= get_dma_residue,
+		._dma_mem_alloc		= dma_mem_alloc,
+		._dma_setup		= hard_dma_setup
 	},
 	{
-		vdma_request_dma,
-		vdma_nop,
-		vdma_get_dma_residue,
-		vdma_mem_alloc,
-		vdma_dma_setup
+		._request_dma		= vdma_request_dma,
+		._free_dma		= vdma_nop,
+		._get_dma_residue	= vdma_get_dma_residue,
+		._dma_mem_alloc		= vdma_mem_alloc,
+		._dma_setup		= vdma_dma_setup
 	}
 };