Re: [Xen-devel] headers.chk failing under certain circumstances.

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 13/12/11 14:25, Jan Beulich wrote:
>>>> On 13.12.11 at 15:21, Keir Fraser <keir@xxxxxxx> wrote:
>> On 13/12/2011 14:17, "Jan Beulich" <JBeulich@xxxxxxxx> wrote:
>>
>>>> Given that uint64_aligned_t is a
>>>> sensible datatype to be using with the hypercall interface, fixing the
>>>> check seems to be the correct solution.
>>> Sensible or not, you would have to find a way to define such a type
>>> in a compiler-independent (i.e. ANSI conforming) manner, and I'm
>>> afraid you won't be able to.
>> Yes, as barbaric as it may seem you just have to make sure that uint64_t
>> gets naturally 8-byte aligned. Luckily none of our interface structures are
>> particularly large, and I believe you can get them checked for 32/64-bit
>> invariance by adding them to xlat.lst.
> ... and invoking the resultant check macro somewhere in the sources.
>
> Jan

Righ ok.  Thanks for the explanation.

Luckily, it appears that all my uint64_t's do actually align on 8 bytes
so I will just use that.

-- 
Andrew Cooper - Dom0 Kernel Engineer, Citrix XenServer
T: +44 (0)1223 225 900, http://www.citrix.com


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