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

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Message-ID: <20131127154600.GC26095@gmail.com>
Date:	Wed, 27 Nov 2013 16:46:00 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Juri Lelli <juri.lelli@...il.com>, tglx@...utronix.de,
	mingo@...hat.com, oleg@...hat.com, fweisbec@...il.com,
	darren@...art.com, johan.eker@...csson.com, p.faure@...tech.ch,
	linux-kernel@...r.kernel.org, claudio@...dence.eu.com,
	michael@...rulasolutions.com, fchecconi@...il.com,
	tommaso.cucinotta@...up.it, nicola.manica@...i.unitn.it,
	luca.abeni@...tn.it, dhaval.giani@...il.com, hgu1972@...il.com,
	paulmck@...ux.vnet.ibm.com, raistlin@...ux.it,
	insop.song@...il.com, liming.wang@...driver.com, jkacur@...hat.com,
	harald.gustafsson@...csson.com, vincent.guittot@...aro.org,
	bruce.ashfield@...driver.com
Subject: Re: [PATCH 08/14] sched: add latency tracing for -deadline tasks.


* Peter Zijlstra <peterz@...radead.org> wrote:

> On Wed, Nov 27, 2013 at 04:35:19PM +0100, Ingo Molnar wrote:
> > So why does GCC then behave like this:
> 
> I think because its a much saner behaviour; also it might still be the
> spec actually says this, its a somewhat opaque text.
> 
> Anyway, yes GCC seems to behave as we 'expect' it to; I just can't find
> the language spec actually guaranteeing this.

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.

Thanks,

	Ingo
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