linux-kernel - Re: [PATCH v12 3/4] pstore/blk: support pmsg for pstore block

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Date:   Thu, 7 Mar 2019 09:05:32 +0800
From:   liaoweixiong <liaoweixiong@...winnertech.com>
To:     Randy Dunlap <rdunlap@...radead.org>,
        Kees Cook <keescook@...omium.org>,
        Anton Vorontsov <anton@...msg.org>,
        Colin Cross <ccross@...roid.com>,
        Tony Luck <tony.luck@...el.com>,
        Jonathan Corbet <corbet@....net>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Arnd Bergmann <arnd@...db.de>, Rob Herring <robh@...nel.org>
Cc:     linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v12 3/4] pstore/blk: support pmsg for pstore block

Hi,

On 2019-03-06 09:16, Randy Dunlap wrote:
> Hi,
> 
> On 2/27/19 11:12 PM, liaoweixiong wrote:
>> diff --git a/fs/pstore/Kconfig b/fs/pstore/Kconfig
>> index 7dfe00b..b417bf5 100644
>> --- a/fs/pstore/Kconfig
>> +++ b/fs/pstore/Kconfig
>> @@ -210,6 +210,27 @@ config PSTORE_BLKOOPS_DMESG_SIZE
>>  	     It is the first priority. Take care of that blkoops will take lower
>>  	     priority settings if higher priority one do not set.
>>  
>> +config PSTORE_BLKOOPS_PMSG_SIZE
>> +	int "pmsg size in kbytes for blkoops"
>> +	depends on PSTORE_BLKOOPS
>> +	default 64
>> +	help
>> +	  This just sets size of pmsg (pmsg_size) for pstore/blk. The value must
>> +	  be a multiple of 4096. Pmsg work only if "blkdev" is set.
> 
> 	                              works
> 

Fixed.

>> +
>> +	  NOTE that, there are three ways to set parameters of blkoops and
>> +	  prioritize according to configuration flexibility. That is
>> +	  Kconfig < device tree < module parameters. It means that the value can
>> +	  be overwritten by higher priority settings.
>> +	  1. Kconfig
>> +	     It	just sets a default value.
>> +	  2. device tree
>> +	     It is set on device tree, which will overwrites value from Kconfig,
> 
> 	                                          overwrite the value from Kconfig,
> 

Fixed.

>> +	     but can also be overwritten by module parameters.
>> +	  3. module parameters
>> +	     It is the first priority. Take care of that blkoops will take lower
>> +	     priority settings if higher priority one do not set.
>> +
>>  config PSTORE_BLKOOPS_TOTAL_SIZE
>>  	int "total size in kbytes for blkoops"
>>  	depends on PSTORE_BLKOOPS
> 
> cheers.
> 

Thank you. Cheers.

-- 
liaoweixiong