linux-kernel - Re: [RESEND] Fast TSC calibration fails with v3.14-rc1 and later

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Message-ID: <1394679416.26565.220.camel@linux-s257.site>
Date:	Thu, 13 Mar 2014 10:56:56 +0800
From:	joeyli <jlee@...e.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Julian Wollrath <jwollrath@....de>, x86@...nel.org,
	LKML <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [RESEND] Fast TSC calibration fails with v3.14-rc1 and later

於 四，2014-03-13 於 00:49 +0100，Thomas Gleixner 提到：
> On Thu, 13 Mar 2014, Rafael J. Wysocki wrote:
> > I agree, and we need to fix that for 3.14.  Patch is appended.
> 
> You beat me by a few minutes. Was about to send out the same, just
> with a more spicy changelog :)
> 
> > ---
> > From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> > Subject: ACPI / init: Invoke early ACPI initialization later
> > 
> > Commit 73f7d1ca3263 (ACPI / init: Run acpi_early_init() before
> > timekeeping_init()) optimistically moved the early ACPI initialization
> > before timekeeping_init(), but that didn't work, because it broke fast
> > TSC calibration for Julian Wollrath on Thinkpad x121e (and most likely
> > for others too).  The reason is that acpi_early_init() enables the SCI
> > and that interferes with the fast TSC calibration mechanism.
> > 
> > Thus follow the original idea to execute acpi_early_init() before
> > efi_enter_virtual_mode() to help the EFI people for now and we can
> > revisit the other problem that commit 73f7d1ca3263 attempted to
> > address in the future (if really necessary).
> 
> Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
>  
> 

Acked-by: Lee, Chun-Yi <jlee@...e.com>

Thanks a lot!
Joey Lee

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