Re: [Xen-devel] [PATCH] fix uninitialized variable error in do_poll()

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 05.10.18 at 12:28, <wei.liu2@xxxxxxxxxx> wrote:
> On Fri, Oct 05, 2018 at 04:12:10AM -0600, Jan Beulich wrote:
>> Now that CONFIG_HVM can (and should) be turned off for the shim, gcc 8.2
>> apparently is no longer sure that "port" is indeed initialized at
>> 
>>     if ( sched_poll->nr_ports == 1 )
>>         v->poll_evtchn = port;
>> 
>> It doesn't look to be impossible for the compiler to prove it is not,
>> but we also can't rely on that to be the case. Add an initializer.
>> 
>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
> 
> TBH I fail to see how CONFIG_HVM would affect do_poll. Also there is
> already build test with gcc 8.2 which never discovered the issue you
> described.

I can't explain the sudden diagnostic too (without taking apart what
exactly the compiler does), but the same config (just with HVM=y)
built fine before. Without any further insight (which I don't think is
worth the time) I don't see how I could improve the description.

Jan



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