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From: Farhan Ali <alifm@linux.ibm.com>
To: Cornelia Huck <cohuck@redhat.com>,
	Christian Borntraeger <borntraeger@de.ibm.com>,
	Thomas Huth <thuth@redhat.com>
Cc: qemu-s390x@nongnu.org, qemu-devel@nongnu.org, qemu-stable@nongnu.org
Subject: Re: [Qemu-devel] [PATCH] s390-ccw: force diag 308 subcode to unsigned long
Date: Thu, 3 May 2018 11:25:08 -0400	[thread overview]
Message-ID: <cbe7b21c-639c-aa64-4777-03d0aa793ac8@linux.ibm.com> (raw)
In-Reply-To: <20180502125221.4877-1-cohuck@redhat.com>



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:qemu-stable@nongnu.org
> Signed-off-by: Cornelia Huck<cohuck@redhat.com>

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

  parent reply	other threads:[~2018-05-03 15:25 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-02 12:52 [Qemu-devel] [PATCH] s390-ccw: force diag 308 subcode to unsigned long Cornelia Huck
2018-05-02 12:56 ` Christian Borntraeger
2018-05-02 13:32 ` Thomas Huth
2018-05-03 15:20 ` [Qemu-devel] [qemu-s390x] " David Hildenbrand
2018-05-03 15:25 ` Farhan Ali [this message]
2018-05-03 15:44   ` [Qemu-devel] " Cornelia Huck
2018-05-03 16:05     ` Farhan Ali
2018-05-03 15:48   ` Eric Blake
2018-05-03 16:03     ` Farhan Ali

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