Re: Alignment of bitmaps for ext2_set_bit et al.

[David S. Miller]

On Thu, 19 Aug 2004 04:22:34 -0700
Andrew Morton <akpm@xxxxxxxx> wrote:

> Paul Mackerras <paulus@xxxxxxxxx> wrote:
> >
> > What can we assume about the alignment of the bitmap pointer passed to
> > the ext2_{set,clear}_bit_atomic functions?  Can we assume that they
> > will be aligned to an long boundary (8 bytes on 64-bit)?
> 
> For ext2 and ext3 it's safe to assume that they are 1024-byte aligned.
> 
> But it's possible that other filesystems are using these (awfully named)
> functions.

FWIW, I've been using 4-byte word atomics for those routines
on sparc64 and have never gotten an unaligned trap for it yet.
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