commit 014705b9880abc5dc9853de96cebab5491a71501
author Eric Nelson <eric.nelson@boundarydevices.com> Wed Apr 11 04:08:53 2012 +0000
committer Anatolij Gustschin <agust@denx.de> Mon Apr 30 16:54:50 2012 +0200
tree c9c19ed362ee0a65e1f88217d2dff20671ef559c
parent 193b2603145946e812d6667cb40bcd9e53633920

fs/fat: align disk buffers on cache line to enable DMA and cache

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
Acked-by: Mike Frysinger <vapier@gentoo.org>

fs/fat/fat.c

diff --git a/fs/fat/fat.c b/fs/fat/fat.c
index 1f95eb4..a3085b5 100644
--- a/fs/fat/fat.c
+++ b/fs/fat/fat.c
@@ -31,6 +31,8 @@
 #include <fat.h>
 #include <asm/byteorder.h>
 #include <part.h>
+#include <malloc.h>
+#include <linux/compiler.h>
 
 /*
  * Convert a string to lowercase.
@@ -62,7 +64,7 @@
 
 int fat_register_device (block_dev_desc_t * dev_desc, int part_no)
 {
-	unsigned char buffer[dev_desc->blksz];
+	ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
 
 	/* First close any currently found FAT filesystem */
 	cur_dev = NULL;
@@ -293,7 +295,7 @@
 		return -1;
 	}
 	if (size % mydata->sect_size) {
-		__u8 tmpbuf[mydata->sect_size];
+		ALLOC_CACHE_ALIGN_BUFFER(__u8, tmpbuf, mydata->sect_size);
 
 		idx = size / mydata->sect_size;
 		ret = disk_read(startsect + idx, 1, tmpbuf);
@@ -428,8 +430,8 @@
  * into 'retdent'
  * Return 0 on success, -1 otherwise.
  */
-__attribute__ ((__aligned__ (__alignof__ (dir_entry))))
-__u8 get_vfatname_block[MAX_CLUSTSIZE];
+__u8 get_vfatname_block[MAX_CLUSTSIZE]
+	__aligned(ARCH_DMA_MINALIGN);
 
 static int
 get_vfatname (fsdata *mydata, int curclust, __u8 *cluster,
@@ -533,8 +535,8 @@
  * Get the directory entry associated with 'filename' from the directory
  * starting at 'startsect'
  */
-__attribute__ ((__aligned__ (__alignof__ (dir_entry))))
-__u8 get_dentfromdir_block[MAX_CLUSTSIZE];
+__u8 get_dentfromdir_block[MAX_CLUSTSIZE]
+	__aligned(ARCH_DMA_MINALIGN);
 
 static dir_entry *get_dentfromdir (fsdata *mydata, int startsect,
 				   char *filename, dir_entry *retdent,
@@ -709,7 +711,7 @@
 		return -1;
 	}
 
-	block = malloc(cur_dev->blksz);
+	block = memalign(ARCH_DMA_MINALIGN, cur_dev->blksz);
 	if (block == NULL) {
 		debug("Error: allocating block\n");
 		return -1;
@@ -765,8 +767,8 @@
 	return ret;
 }
 
-__attribute__ ((__aligned__ (__alignof__ (dir_entry))))
-__u8 do_fat_read_block[MAX_CLUSTSIZE];
+__u8 do_fat_read_block[MAX_CLUSTSIZE]
+	__aligned(ARCH_DMA_MINALIGN);
 
 long
 do_fat_read (const char *filename, void *buffer, unsigned long maxsize,
@@ -828,7 +830,7 @@
 	}
 
 	mydata->fatbufnum = -1;
-	mydata->fatbuf = malloc(FATBUFSIZE);
+	mydata->fatbuf = memalign(ARCH_DMA_MINALIGN, FATBUFSIZE);
 	if (mydata->fatbuf == NULL) {
 		debug("Error: allocating memory\n");
 		return -1;