linux-kernel - Re: [PATCH] PM-Trace: add pm-trace support for suspending phase

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Message-ID: <54DB6B13.4080807@linux.intel.com>
Date:	Wed, 11 Feb 2015 22:45:40 +0800
From:	"Fu, Zhonghui" <zhonghui.fu@...ux.intel.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	"rjw@...ysocki.net >> Rafael J. Wysocki" <rjw@...ysocki.net>,
	pavel@....cz, len.brown@...el.com, linux-pm@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] PM-Trace: add pm-trace support for suspending phase


I have sent a new patch with the same subject in another mail. Any comments are welcome.

Thanks,
Zhonghui

On 2015/2/11 10:50, Fu, Zhonghui wrote:
> On 2015/2/10 5:55, Greg Kroah-Hartman wrote:
>> On Mon, Feb 09, 2015 at 12:03:23PM +0800, Fu, Zhonghui wrote:
>>> >From ec9c0f24e800461361eaf8b280abe4272b00772d Mon Sep 17 00:00:00 2001
>>> From: Zhonghui Fu <zhonghui.fu@...ux.intel.com>
>>> Date: Mon, 9 Feb 2015 11:09:22 +0800
>>> Subject: [PATCH] PM-Trace: add pm-trace support for suspending phase
>> Why is this crud here?
> I will fix this in new patch.
>>> Occasinally, the system can't come back up after suspend/resume
>>> due to problems of device suspending phase. This patch make
>>> PM_TRACE infrastructure cover device suspending phase of
>>> suspend/resume process, and the information in RTC can tell
>>> develpers which device suspending function make system hang.
>>>
>>> Signed-off-by: Zhonghui Fu <zhonghui.fu@...ux.intel.com>
>>> ---
>>>  arch/x86/include/asm/resume-trace.h |    2 +-
>>>  drivers/base/power/main.c           |   30 +++++++++++++++++++++---------
>>>  include/linux/resume-trace.h        |    2 +-
>>>  3 files changed, 23 insertions(+), 11 deletions(-)
>>>
>>> diff --git a/arch/x86/include/asm/resume-trace.h b/arch/x86/include/asm/resume-trace.h
>>> index 3ff1c2c..0ca2215 100644
>>> --- a/arch/x86/include/asm/resume-trace.h
>>> +++ b/arch/x86/include/asm/resume-trace.h
>>> @@ -3,7 +3,7 @@
>>>  
>>>  #include <asm/asm.h>
>>>  
>>> -#define TRACE_RESUME(user)					\
>>> +#define TRACE_SUSPEND_RESUME(user)				\
>>>  do {								\
>>>  	if (pm_trace_enabled) {					\
>>>  		const void *tracedata;				\
>> Why rename this?
>>
>> If you want to do that, do it in 2 different functions (rename first,
>> with justification, add new functionality in a second patch)
> Good comments, I will sent a new patch.
>>> @@ -1078,7 +1082,7 @@ static int device_suspend_noirq(struct device *dev)
>>>  {
>>>  	reinit_completion(&dev->power.completion);
>>>  
>>> -	if (pm_async_enabled && dev->power.async_suspend) {
>>> +	if (is_async(dev)) {
>> Why change this logic?
> Now, PM Trace does not support asynchronous suspend/resume mode. is_async() function can inhibit async mode during using PM Trace.
>
> Thanks,
> Zhonghui
>> greg k-h
>> --
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