linux-kernel - [PATCH 6/10] mach64: use unaligned access

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Message-ID: <alpine.LRH.2.02.1401231307120.31739@file01.intranet.prod.int.rdu2.redhat.com>
Date:	Thu, 23 Jan 2014 13:19:15 -0500 (EST)
From:	Mikulas Patocka <mpatocka@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
cc:	linux-kernel@...r.kernel.org
Subject: [PATCH 6/10] mach64: use unaligned access

This patch fixes mach64 to use unaligned access to the font bitmap.

This fixes unaligned access warning on sparc64 when 14x8 font is loaded.

On x86(64), unaligned access is handled on hardware, so both functions
le32_to_cpup and get_unaligned_le32 perform the same operation.

On RISC machines, unaligned access is not handled in hardware, so we
better use get_unaligned_le32 to avoid the unaligned trap and warning.

Signed-off-by: Mikulas Patocka <mpatocka@...hat.com>
Cc: stable@...r.kernel.org

---
 drivers/video/aty/mach64_accel.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Index: linux-3.4.3-fast/drivers/video/aty/mach64_accel.c
===================================================================
--- linux-3.4.3-fast.orig/drivers/video/aty/mach64_accel.c	2012-07-02 00:10:56.000000000 +0200
+++ linux-3.4.3-fast/drivers/video/aty/mach64_accel.c	2012-07-02 00:13:29.000000000 +0200
@@ -4,6 +4,7 @@
  */
 
 #include <linux/delay.h>
+#include <asm/unaligned.h>
 #include <linux/fb.h>
 #include <video/mach64.h>
 #include "atyfb.h"
@@ -419,7 +420,7 @@ void atyfb_imageblit(struct fb_info *inf
 		u32 *pbitmap, dwords = (src_bytes + 3) / 4;
 		for (pbitmap = (u32*)(image->data); dwords; dwords--, pbitmap++) {
 			wait_for_fifo(1, par);
-			aty_st_le32(HOST_DATA0, le32_to_cpup(pbitmap), par);
+			aty_st_le32(HOST_DATA0, get_unaligned_le32(pbitmap), par);
 		}
 	}
 

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