Re: [PATCH] Btrfs: fix unaligned access at btrfs_csum_final()

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On Mon, Mar 22, 2010 at 02:31:08AM +0300, Alexander Beregalov wrote:
> Btrfs on Sparc64 produces a lot of warnings
> Kernel unaligned access at TPC[10148c84] btrfs_csum_final+0x44/0x60 [btrfs]

Great, thanks for trackign this down.

> 
> It happens when btrfs_csum_final is called from write_dev_supers():
> 2195:	btrfs_csum_final(crc, sb->csum);
> 
> crc is u32, aligning sb->csum on 4-byte boundary fixes the problem.

So the size of the csum field is already 4 byte aligned, I'm surprised
we need this?

-chris
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