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Re: [qemu-s390x] [Qemu-devel] [PATCH] s390-ccw: force diag 308 subcode t

From: Farhan Ali
Subject: Re: [qemu-s390x] [Qemu-devel] [PATCH] s390-ccw: force diag 308 subcode to unsigned long
Date: Thu, 3 May 2018 11:25:08 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0

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")
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?


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