linux-kernel - Re: [RFC PATCH 0/4] Drop custom logging

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Date:   Sun, 22 Jan 2023 19:07:03 +0100
From:   Stefan Wahren <stefan.wahren@...e.com>
To:     Kieran Bingham <kieran.bingham@...asonboard.com>,
        Umang Jain <umang.jain@...asonboard.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Adrien Thierry <athierry@...hat.com>,
        Dan Carpenter <error27@...il.com>,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        linux-arm-kernel@...ts.infradead.org,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        linux-kernel@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org,
        linux-staging@...ts.linux.dev, linux-media@...r.kernel.org,
        Phil Elwell <phil@...pberrypi.com>
Subject: Re: [RFC PATCH 0/4] Drop custom logging

Hi Kieran,

Am 22.01.23 um 17:26 schrieb Kieran Bingham:
> Hi Stefan,
>
> Quoting Stefan Wahren (2023-01-22 14:21:05)
>> Hi Umang,
>>
>> Am 18.01.23 um 12:58 schrieb Umang Jain:
>>> Drop custom logging from the vchiq interface.
>>> Mostly of them are replaced with dev_dbg and friends
>>> and/or pr_info and friends.
>>>
>>> The debugfs log levels (in 4/4) are mapped to kernel
>>> logs levels (coming from include/linux/kern_levels.h)
>>> Would like some thoughts on it as I am not sure (hence
>>> marking this is RFC)
>>>
>>>   From drivers/staging/vc04_services/interface/TODO:
>>>
>>> """
>>> * Cleanup logging mechanism
>>>
>>> The driver should probably be using the standard kernel logging mechanisms
>>> such as dev_info, dev_dbg, and friends.
>>> """
>> at first i want to thank you for the work on vchiq so far.
>>
>> There is something which is not directly related to this series, but it
>> is also about debugging. The driver has a buffer which is accessed by
>> it's own DEBUG_* macros. The content of this debug buffer can be dumped
>> via the /dev/vchiq which is also used by ioctl. I would appreciate to
>> move this dump feature into a new debugfs entry.
> Do you have a full list of the tasks you'd like to see completed ?
> (including/or above drivers/staging/vc04_services/interface/TODO)

i consider every point except of point 1 (importing new drivers) as 
necessary to leave staging.

Additionally there is the additional point (i can add them to the TODO) 
above. Unfortunately i don't have a complete insight, how vchiq should 
be to be acceptable. Sorry, if i can't help you further with possible 
resource planning.

Are some points on the TODO list unclear?

Thanks

>
> It would help to have a clear picture of tasks needed to get this driver
> destaged, so that we can support the ISP upstream.
>
> Regards
> --
> Kieran