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

From: Chong Li <lichong659@gmail.com>
To: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Chong Li <chong.li@wustl.edu>, Wei Liu <wei.liu2@citrix.com>,
	Sisu Xi <xisisu@gmail.com>,
	George Dunlap <george.dunlap@eu.citrix.com>,
	Dario Faggioli <dario.faggioli@citrix.com>,
	Ian Jackson <Ian.Jackson@eu.citrix.com>,
	xen-devel <xen-devel@lists.xen.org>,
	Meng Xu <mengxu@cis.upenn.edu>,
	Dagaen Golomb <dgolomb@seas.upenn.edu>
Subject: Re: [PATCH v9 for Xen 4.7 3/4] libxl: enable per-VCPU parameter for RTDS
Date: Wed, 6 Apr 2016 14:20:55 -0500	[thread overview]
Message-ID: <CAGHO-irt1GN9CkNyvon4gFcrnoTTaR_-g32=wdqxYFUV4jikeQ@mail.gmail.com> (raw)
In-Reply-To: <57055B74.3070908@citrix.com>

On Wed, Apr 6, 2016 at 1:54 PM, Andrew Cooper <andrew.cooper3@citrix.com> wrote:
> 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

I see. I can do a sanity check on num_vcpus before the while loop.

Do I have to re-send the whole patch series? Or maybe just something
like a bug fix patch?

Chong

-- 
Chong Li
Department of Computer Science and Engineering
Washington University in St.louis

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