Re: [PATCH] Introduce compat_u64 and compat_s64 types

From: David Woodhouse
Date: Fri Jun 15 2007 - 08:38:47 EST

On Fri, 2007-06-15 at 06:11 -0600, Matthew Wilcox wrote:
> You're relying on compat_[us]64 being only used in structures which are
> already packed.

In which case the whole exercise is pointless, on account of the
structure being already packed. It was _already_ laid out the same on
32-bit and 64-bit builds.

> If someone uses them in a non-packed struct, they won't
> decrease the alignment. I think it would be more effective to specify
> it as:
> __attribute__((aligned(4), packed))

Good point. Yes, it looks like we need the additional 'packed' in order
for the aligned(4) to be anything other than a no-op.


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