Re: [Qemu-devel] [PATCH] s390-ccw: force diag 308 subcode to unsigned long

[Farhan Ali]

On 05/02/2018 08:52 AM, Cornelia Huck wrote:
> We currently pass an integer as the subcode parameter. However,
> the upper bits of the register containing the subcode need to
> be 0, which is not guaranteed unless we explicitly specify the
> subcode to be an unsigned long value.
>
> Fixes: d046c51dad3 ("pc-bios/s390-ccw: Get device address via diag 308/6")
> Cc:address@hidden
> Signed-off-by: Cornelia Huck<address@hidden>

Sorry for my ignorance, but is there a C standard that says upper bits 
of an int is not guaranteed to be 0?

Thanks
Farhan