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Subject: Re: [PATCH v12 3/4] pstore/blk: support pmsg for pstore block
To:     liaoweixiong <liaoweixiong@allwinnertech.com>,
        Kees Cook <keescook@chromium.org>,
        Anton Vorontsov <anton@enomsg.org>,
        Colin Cross <ccross@android.com>,
        Tony Luck <tony.luck@intel.com>,
        Jonathan Corbet <corbet@lwn.net>,
        Mauro Carvalho Chehab <mchehab+samsung@kernel.org>,
        "David S. Miller" <davem@davemloft.net>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Nicolas Ferre <nicolas.ferre@microchip.com>,
        Arnd Bergmann <arnd@arndb.de>, Rob Herring <robh@kernel.org>
Cc:     linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org
References: <1551337948-16451-1-git-send-email-liaoweixiong@allwinnertech.com>
 <1551337948-16451-4-git-send-email-liaoweixiong@allwinnertech.com>
From:   Randy Dunlap <rdunlap@infradead.org>
Message-ID: <a7ae72c0-2425-a43a-da53-22f30a173f7e@infradead.org>
Date:   Tue, 5 Mar 2019 17:16:41 -0800
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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

> +
> +	  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,

> +	     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.
-- 
~Randy