Re: [Xen-devel] [PATCH 1/2] fix locking in offline_page()

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 27.11.13 at 11:01, Andrew Cooper <andrew.cooper3@xxxxxxxxxx> wrote:
> On 27/11/13 08:25, Jan Beulich wrote:
>>          else
>>          {
>>              *status = PG_OFFLINE_OWNED | PG_OFFLINE_PENDING |
>> -              (owner->domain_id << PG_OFFLINE_OWNER_SHIFT);
>> +                      (owner->domain_id << PG_OFFLINE_OWNER_SHIFT);
> 
> domain_id will be promoted from a uint16_t to an int32_t, then shifted
> left by 16 bits which is undefined if the top of domain_id bit was set.

That promotion is done by zero extension, so I don't figure what
you think is undefined here.

Furthermore I suppose you realize that all the patch does here is
adjust indentation.

Jan


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