Re: [PATCH v9 for Xen 4.7 3/4] libxl: enable per-VCPU parameter for RTDS

[Andrew Cooper <andrew.cooper3@citrix.com>]

On 06/04/16 17:41, Chong Li wrote:
> On Wed, Apr 6, 2016 at 11:36 AM, Dario Faggioli
> <dario.faggioli@citrix.com> wrote:
>> On Wed, 2016-04-06 at 16:38 +0100, Ian Jackson wrote:
>>> Ian Jackson writes ("Re: [PATCH v9 for Xen 4.7 3/4] libxl: enable
>>> per-VCPU parameter for RTDS"):
>>>> Dario points out on irc that perhaps the problem is that I didn't
>>>> apply 2/4.  I wasn't CC'd on 2/4, so I foolishly assumed it was a
>>>> hypervisor patch (and the HV parts are already in tree).
>>>>
>>>> I will check my view of the xen-devel list.
>>> Indeed.  With 2/4 it builds.  4/4 was also not CC'd to me.  I used a
>>> copy from the list.
>>>
>>> I have pushed all four.
>>>
>> Thanks Ian!
>>
>> So, Chong, clearly, the build failure was not your fault (as there is
>> no actual build failure), but please, always double check (even when
>> sending new versions of a series) that the appropriate maintainers are
>> Cc-ed... This would help limiting problems like this one we've seen
>> here.
>>
> Yes, I'll.
>
> Thanks for your help on this.
> Chong

Yet another build failure on CentOS.

xc_rt.c: In function 'xc_sched_rtds_vcpu_set':
xc_rt.c:71:9: error: 'rc' may be used uninitialized in this function
[-Werror=maybe-uninitialized]
     int rc;
         ^
xc_rt.c: In function 'xc_sched_rtds_vcpu_get':
xc_rt.c:105:9: error: 'rc' may be used uninitialized in this function
[-Werror=maybe-uninitialized]
     int rc;
         ^
cc1: all warnings being treated as errors

In both cases, if your while loop doesn't execute (i.e. the user passes
num_vcpus = 0), rc is genuinely uninialised when used at the end of the
function.

~Andrew

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