linux-kernel - Re: [RFC v5 2/4] pstore/blk: add sample for pstore

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Message-ID: <6f61bd6c-a274-92ae-75df-83a2265d3338@allwinnertech.com>
Date:   Sat, 19 Jan 2019 17:26:06 +0800
From:   廖威雄 <liaoweixiong@...winnertech.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     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>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "David S. Miller" <davem@...emloft.net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Arnd Bergmann <arnd@...db.de>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC v5 2/4] pstore/blk: add sample for pstore_blk

On 2019-01-18 08:21, Kees Cook wrote:
> On Thu, Jan 17, 2019 at 4:15 PM Kees Cook <keescook@...omium.org> wrote:
>>
>> On Mon, Jan 7, 2019 at 4:01 AM liaoweixiong
>> <liaoweixiong@...winnertech.com> wrote:
>>>
>>> It is a sample for pstore_blk, using general ram rather than block device.
>>> According to pstore_blk, the data will be saved to ram buffer if not
>>> register device path and apis for panic. So, it can only used to dump
>>> Oops and some things will not reboot.
>>
>> I'm not sure I see the purpose of this implementation? Doesn't this
>> just cause all the pstore machinery to skip any actions? i.e. without
>> bzinfo->part_path, won't blkz_sample_write() just return -EINVAL, etc?
> 
> Say, instead of a no-op driver, can you build something like the how
> ramoops processes module parameters, so that a person can define an
> arbitrary device at boot time for blkoops? This also allows for easier
> runtime testing too.

Sure, i will do it in next version. But it can only use for oops,
excluding panic.
I have no idea how to pass panic operation parameters.

> 
> This all looks good, with some minor tweaks as mentioned. And on
> closer review, yeah, it doesn't look like it shares much with ramoops.
> :)
> 
> Thanks for sending this series; I look forward to the next version. :)
> 
> -Kees
>