Re: [PATCH 08/14] sched: add latency tracing for -deadline tasks.

[Peter Zijlstra]

On Wed, Nov 27, 2013 at 10:56:16AM -0500, Steven Rostedt wrote:
> > So from C99 standard §6.7.8 (Initialization)/21:
> > 
> >     "If there are fewer initializers in a brace-enclosed list than 
> >   there are elements or members of an aggregate, or fewer characters 
> >   in a string literal used to initialize an array of known size than 
> >   there are elements in the array, the remainder of the aggregate 
> >   shall be initialized implicitly the same as objects that have static 
> >   storage duration."
> > 
> > static initialization == zeroing in this case.
> > 
> 
> The confusion here is that the above looks to be talking about arrays.
> But it really doesn't specify structures.
> 
> But searching the internet, it looks as though most people believe it
> applies to structures, and any compiler that does otherwise will most
> likely break applications.
> 
> That is, this looks to be one of the gray areas that the compiler
> writers just happen to do what's most sane. And they probably assume
> it's talking about structures as well, hence the lack of warnings.

16 says initializers for aggregate or union types are brace-enclosed
lists. A struct is an aggregate type.


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