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

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Message-ID: <b1a26368-3753-0d32-434b-e220dd9c06b4@i2se.com>
Date:   Wed, 18 Jan 2023 18:54:56 +0100
From:   Stefan Wahren <stefan.wahren@...e.com>
To:     Umang Jain <umang.jain@...asonboard.com>,
        Phil Elwell <phil@...pberrypi.com>
Cc:     linux-media@...r.kernel.org, linux-staging@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-rpi-kernel@...ts.infradead.org,
        Florian Fainelli <f.fainelli@...il.com>,
        Adrien Thierry <athierry@...hat.com>,
        Dan Carpenter <error27@...il.com>,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Kieran Bingham <kieran.bingham@...asonboard.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 0/4] Drop custom logging

Hi Umang,

[add Phil]

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.

i don't have any experience with vchiq logging/debug. So i'm not sure if 
it's acceptable to lose the second log level dimension (like 
vchiq_arm_log_level) completely. Complex drivers like brcmfmac have a 
debug mask to avoid log spamming [1]. Maybe this is a compromise.

Btw some loglevel locations has already been messed up during 
refactoring :-(

[1] - drivers/net/wireless/broadcom/brcm80211/brcmfmac/debug.h

> """
>
> Umang Jain (4):
>    staging: vc04_services: vchiq_core: Drop custom logging
>    staging: vc04_services: vchiq_arm: Drop custom logging
>    staging: vc04_services: Drop custom logging
>    staging: vc04_services: Drop remnants of custom logging
>
>   .../interface/vchiq_arm/vchiq_arm.c           | 151 +++---
>   .../interface/vchiq_arm/vchiq_connected.c     |   5 +-
>   .../interface/vchiq_arm/vchiq_core.c          | 479 ++++++++----------
>   .../interface/vchiq_arm/vchiq_core.h          |  39 --
>   .../interface/vchiq_arm/vchiq_debugfs.c       |  26 +-
>   .../interface/vchiq_arm/vchiq_dev.c           |  78 ++-
>   6 files changed, 329 insertions(+), 449 deletions(-)
>