linux-kernel - Re: [Xen-devel] [PATCH 1/3] cpuidle: If disable_cpuidle() is called, set pm_idle to default

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Message-ID: <CAJvTdKnSLD8q3QqcFVY7u-eyhTnN=2rQ3rTmd1qeJ7nGz4y5Bg@mail.gmail.com>
Date:	Sun, 13 Nov 2011 01:00:15 -0500
From:	Len Brown <lenb@...nel.org>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:	linux-kernel@...r.kernel.org, x86@...nel.org, len.brown@...el.com,
	tglx@...utronix.de, jeremy@...p.org, hpa@...or.com, bp@...en8.de,
	tj@...nel.org, trenn@...e.de, stable@...nel.org, mingo@...hat.com,
	xen-devel@...ts.xensource.com
Subject: Re: [Xen-devel] [PATCH 1/3] cpuidle: If disable_cpuidle() is called,
 set pm_idle to default_idle.

> And just found that there is a BZ for this as well:
> https://bugzilla.redhat.com/show_bug.cgi?id=739499
>
> And this patch fixes the Linux kernel to boot under Amazon EC2.

doesn't matter.

Working around an Amazon EC2 bug in a newly compiled upstream kernel
isn't going to help with any of the kernels that don't include that workaround.

Amazon EC2 should not advertise MWAIT support that it does not have,
and all kernels should run on it w/o any workaround.

Len Brown, Intel Open Source Technology Center
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