linux-kernel - Re: [PATCH 08/17] Add main.c

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Date: Wed, 5 Jun 2024 12:04:29 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: "Nemanov, Michael" <michael.nemanov@...com>, Kalle Valo
 <kvalo@...nel.org>, Johannes Berg <johannes.berg@...el.com>,
 Breno Leitao <leitao@...ian.org>, Justin Stitt <justinstitt@...gle.com>,
 Kees Cook <keescook@...omium.org>, linux-wireless@...r.kernel.org,
 linux-kernel@...r.kernel.org
Cc: Sabeeh Khan <sabeeh-khan@...com>
Subject: Re: [PATCH 08/17] Add main.c

On 05/06/2024 11:55, Nemanov, Michael wrote:
> On 5/31/2024 4:50 PM, Nemanov, Michael wrote:
>> On 5/22/2024 12:46 PM, Krzysztof Kozlowski wrote:>
>>>> +
>>>> +static int cc33xx_probe(struct platform_device *pdev)
>>>> +{
>>>> +	struct cc33xx *cc;
>>>> +	struct ieee80211_hw *hw;
>>>> +	struct cc33xx_platdev_data *pdev_data = dev_get_platdata(&pdev->dev);
>>>> +	const char *nvs_name;
>>>> +	int ret;
>>>> +
>>>> +	cc33xx_debug(DEBUG_CC33xx, "Wireless Driver Version %s", DRV_VERSION);
>>>
>>> Drop
>>>
>>>> +
>>>> +	if (!pdev_data) {
>>>> +		cc33xx_error("can't access platform data");
>>>
>>> Do not use your own print code. Use standard dev_() calls. This applies
>>> *everywhere*.
>>>
>>> [...]
>>>
>>>> +	cc33xx_debug(DEBUG_CC33xx, "WLAN CC33xx platform device probe done");
>>>
>>> Drop, tracing/sysfs gices you this. Do not print simple
>>> success/entry/exit messages.
>>>
>>> [...]
>>>
>>>> +};
>>>> +MODULE_DEVICE_TABLE(platform, cc33xx_id_table);
>>>> +
>>>> +static struct platform_driver cc33xx_driver = {
>>>> +	.probe		= cc33xx_probe,
>>>> +	.remove		= cc33xx_remove,
>>>> +	.id_table	= cc33xx_id_table,
>>>> +	.driver = {
>>>> +		.name	= "cc33xx_driver",
>>>> +	}
>>>> +};
>>>> +
>>>> +u32 cc33xx_debug_level = DEBUG_NO_DATAPATH;
>>>>
>>> Why this is global? Why u32? Why global variable is defined at the end
>>> of the file?!?!
>>  
>> cc33xx_debug_level together with cc33xx_debug/info/error() macros is how
>> all traces were done in drivers/net/wireless/ti/wlcore/ (originally was
>> wl1271_debug/info etc.)
>> It enables / disables traces without rebuilding or even reloading which
>> is very helpful for remote support. These macros map to dynamic_pr_debug
>> / pr_debug. I saw similar wrappers in other wireless drivers (ath12k).
>> This is also why there are plenty of cc33xx_debug() all over the code,
>> most are silent by default.
> 
> Any more thoughts on debug traces? I'll remove all trivial function 
> entry / exit traces as Krzysztof requested. Is it OK to keep other 
> cc33xx_debug() calls which will be off by default?

Sorry, I don't see the point. Dynamic debug gives you debug control. You
just added orthogonal code to existing debug infrastructure, so as far
as I am concerned, this should be dropped in favor of standard debugging
calls.

Best regards,
Krzysztof