fs: btrfs: Add missing cache aligned allocation

The superblock buffer must be cache aligned, since it might be used
in DMA context, allocate it using ALLOC_CACHE_ALIGN_BUFFER() just
like it was done in btrfs_read_superblock() and read_tree_node().

This fixes this output on boot and non-working btrfs on iMX53:
CACHE: Misaligned operation at range [ced299d0, ced2a9d0]

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Marek Behún <marek.behun@nic.cz>
Cc: Qu Wenruo <wqu@suse.com>
Reviewed-by: Marek Behún <marek.behun@nic.cz>

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index c6fdec95c1646f256beb342eee2e0e9224fb113f..349411c3ccdbfcd837cad9fe81b5dcd9a9a739f4 100644 (file)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -291,7 +291,7 @@ error_out:
 int btrfs_read_dev_super(struct blk_desc *desc, struct disk_partition *part,
                         struct btrfs_super_block *sb)
 {
-       char tmp[BTRFS_SUPER_INFO_SIZE];
+       ALLOC_CACHE_ALIGN_BUFFER(char, tmp, BTRFS_SUPER_INFO_SIZE);
        struct btrfs_super_block *buf = (struct btrfs_super_block *)tmp;
        int ret;