linux-kernel - RE: [PATCH v2] video: hyperv: hyperv_fb: refresh the VM screen by force on VM panic

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Message-ID: <EE124450C0AAF944A40DD71E61F878C987A663@SINEX14MBXC417.southpacific.corp.microsoft.com>
Date:	Tue, 8 Jul 2014 22:17:48 +0000
From:	Dexuan Cui <decui@...rosoft.com>
To:	Dan Carpenter <dan.carpenter@...cle.com>
CC:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"driverdev-devel@...uxdriverproject.org" 
	<driverdev-devel@...uxdriverproject.org>,
	"plagnioj@...osoft.com" <plagnioj@...osoft.com>,
	"tomi.valkeinen@...com" <tomi.valkeinen@...com>,
	"linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
	"olaf@...fle.de" <olaf@...fle.de>,
	"apw@...onical.com" <apw@...onical.com>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>
Subject: RE: [PATCH v2] video: hyperv: hyperv_fb: refresh the VM screen by
 force on VM panic

> -----Original Message-----
> From: Dan Carpenter [mailto:dan.carpenter@...cle.com]
> Sent: Tuesday, July 8, 2014 17:27 PM
> To: Dexuan Cui
> Cc: gregkh@...uxfoundation.org; linux-kernel@...r.kernel.org; driverdev-
> devel@...uxdriverproject.org; plagnioj@...osoft.com;
> tomi.valkeinen@...com; linux-fbdev@...r.kernel.org; olaf@...fle.de;
> apw@...onical.com; jasowang@...hat.com; Haiyang Zhang
> Subject: Re: [PATCH v2] video: hyperv: hyperv_fb: refresh the VM screen by
> force on VM panic
> 
> Don't use likely/unlikely unless you have benchmark numbers to show that
> it makes a speed up.
> 
> regards,
> dan carpenter

Hi Dan,
Here the variable 'synchronous_fb' is only set to true when the system panics.
So before the system panics, it's always 'unlikely'. :-)

Thanks,
-- Dexuan
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