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SubjectAlignment of bitmaps for ext2_set_bit et al.
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)?

Olof has made a patch that uses atomics for these on ppc64 rather than
locking and unlocking a lock, but it will only work correctly if the
bitmap is always 8-byte aligned.

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