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

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Message-ID: <20131127162405.GB24773@redhat.com>
Date:	Wed, 27 Nov 2013 17:24:06 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Juri Lelli <juri.lelli@...il.com>, tglx@...utronix.de,
	mingo@...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.

On 11/27, Peter Zijlstra wrote:
>
> Anyway, yes GCC seems to behave as we 'expect' it to; I just can't find
> the language spec actually guaranteeing this.

And the kernel already assumes that gcc should do this, for example

	struct siginfo info = {};

in do_tkill().

(this initialization should prevent the leak of uninitialized members
 to userspace).

Oleg.

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