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From: David Miller <davem@davemloft.net>
Subject: Re: bug in passing file descriptors
Date: Mon, 07 Oct 2013 15:42:26 -0400 (EDT)
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From: Steve Rago <sar@nec-labs.com>
Date: Mon, 7 Oct 2013 15:17:24 -0400

> Except when sizeof(long) can change and you need to maintain binary
> compatibility with older applications.  x86 comes to mind as a
> relevant example: used to be 32 bits, but is 64 now.

There is no compatability issue.

32-bit tasks will always see the 4-byte align/length.
64-bit tasks will always see the 8-byte align/length.