Re: [Xen-devel] [PATCH 1/1] hvm.c: Prevent gcc uninitialised var warning

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 25.03.15 at 21:03, <dslutz@xxxxxxxxxxx> wrote:
> On 03/25/15 11:48, Jan Beulich wrote:
>>>>> On 25.03.15 at 16:02, <andrew.cooper3@xxxxxxxxxx> wrote:
>>> As an aside, the compiler is in a very easy position to spot this.  The
>>> error means that GCC has positively identified a basic block which does
>>> use bufioreq_pfn before it has been initialised.
>>>
> 
> If the compiler is right, how come the messages says:
> 
> may be used
> 
> which to me says that it's determination is not 100%

No, that's a wrong interpretation of the wording - it instead means
that there is at least one path where the variable gets initialized,
and at least one where that's not provably the case. As opposed
to a variable being used uninitialized no matter what path leads to
the use site.

Jan


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