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From: ming.lei@canonical.com (Ming Lei)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] arm: fix lockdep warning of "unannotated irqs-off"
Date: Thu, 2 Jun 2011 09:32:51 +0800	[thread overview]
Message-ID: <20110602093251.0001a4cd@tom-ThinkPad-T410> (raw)
In-Reply-To: <20110601160144.GN3660@n2100.arm.linux.org.uk>


Hi Russell,

Thanks for your detailed explain.

On Wed, 1 Jun 2011 17:01:44 +0100
Russell King - ARM Linux <linux@arm.linux.org.uk> wrote:

> So, the way things are setup at the moment on ARM, we "optimize" the
> overhead of telling lockdep that IRQs are enabled while userspace is
> running away _provided_ we are not doing IRQs-off latency tracing.
> IOW, when CONFIG_IRQSOFF_TRACER is not set, we optimize away the
> trace_hardirq_on call when entering userspace, and the
> trace_hardirq_off call when leaving userspace.

Sorry, I did not notice this "optimization" before, and will
change the dependency and update the patch.

BTW, the patch also fixes for irq off tracer.


thanks,
--
Ming Lei

      reply	other threads:[~2011-06-02  1:32 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-06-01  7:42 [PATCH] arm: fix lockdep warning of "unannotated irqs-off" Ming Lei
2011-06-01  9:34 ` Russell King - ARM Linux
2011-06-01 13:17   ` Ming Lei
2011-06-01 13:22     ` Russell King - ARM Linux
2011-06-01 14:28       ` Ming Lei
2011-06-01 14:46         ` Russell King - ARM Linux
2011-06-01 15:52           ` Ming Lei
2011-06-01 16:01             ` Russell King - ARM Linux
2011-06-02  1:32               ` Ming Lei [this message]

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