From: jamal <[EMAIL PROTECTED]>
Date: Mon, 20 Feb 2006 08:10:44 -0500

> Explain the rules to me: is it because the alignment in xfrm_usersa_id
> may change in the future?

Alignment on x86 of u64 is different from x86_64 and ia64,
so we must be extremely careful else we will have to
translate these structures going in and out of compat
processes, which is beyond painful.

So we should ensure the structure layout and alignment
is identical on all systems, 32-bit or 64-bit, in order
to avoid these problems.
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