linux-kernel - Re: [PATCH] arm64: enable generic idle loop

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Message-ID: <20150821091446.GB4280@leoy-linaro>
Date:	Fri, 21 Aug 2015 17:14:46 +0800
From:	Leo Yan <leo.yan@...aro.org>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	Will Deacon <will.deacon@....com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: enable generic idle loop

On Fri, Aug 21, 2015 at 10:00:43AM +0100, Catalin Marinas wrote:
> On Fri, Aug 21, 2015 at 11:40:22AM +0800, Leo Yan wrote:
> > Enable generic idle loop for ARM64, so can support for hlt/nohlt
> > command line options to override default idle loop behavior.
> 
> Just curious, what do you need this for?

With this config, usually we can add "nohlt" in command line to force
the cpu will never be powered off; so can quickly narrow down if some
issues are related with cpuidle or not.

And if CPU is powered off, then its debug logic also will be powered off.
So we can simply use this method to let debugger always hot connect with
the target CPU.

Thanks,
Leo Yan
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