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Re: [Xen-devel] Re: 32/64-bit hypercall interface -- long long alignment

from [Hollis Blanchard] [Permanent Link][Original]
To: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-devel] Re: 32/64-bit hypercall interface -- long long alignment
From: Hollis Blanchard <hollisb@xxxxxxxxxx>
Date: Tue, 4 Oct 2005 16:46:42 -0500
Cc: Andi Kleen <ak@xxxxxxx>
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On Tuesday 04 October 2005 07:08, Andi Kleen wrote:
>
> There are some traps. e.g. i386 has a different alignment for u64 (4
> bytes) rather than the natural 8 bytes used on 64bits which causes
> many problems (like the iptables issue mentioned above). If you use
> this way use a new type which is long long
> __attribute__((aligned(8))), not just long long.

Good to know! Thanks for the warning...

-- 
Hollis Blanchard
IBM Linux Technology Center

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