>>> On 25.04.18 at 12:06, <wei.l...@citrix.com> wrote:
> On Wed, Apr 25, 2018 at 11:04:26AM +0200, Olaf Hering wrote:
>> Am Wed, 25 Apr 2018 09:59:23 +0100
>> schrieb Wei Liu <wei.l...@citrix.com>:
>>
>> > Do you have the full diff of your changes?
>>
>> Not right now. But without 'val', or val being uint, the same error happens
> in f():
>>
>> #include <stdio.h>
>> void f(void)
>> {
>> unsigned short req_prod = 0, req_cons = 65400;
>> unsigned short val;
>> val = req_prod - req_cons;
>> printf("req_prod - req_cons %u\n", val);
>> printf("req_prod - req_cons %x\n", val);
>> }
>
> What Jan said.
>
> Integer promotion makes unsigned short into unsigned int first then do
> the calculation.
Not exactly - it promotes to plain (i.e. signed) int.
Jan
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xenproject.org
https://lists.xenproject.org/mailman/listinfo/xen-devel
