netdev - Re: [PATCH] wifi: mac80211: Use subsystem appropriate debug call

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Date: Thu, 21 Dec 2023 08:38:32 +0200
From: Kalle Valo <kvalo@...nel.org>
To: "Ma, Jun" <majun@....com>
Cc: Mario Limonciello <mario.limonciello@....com>,  Johannes Berg
 <johannes@...solutions.net>,  "David S . Miller" <davem@...emloft.net>,
  Eric Dumazet <edumazet@...gle.com>,  Jakub Kicinski <kuba@...nel.org>,
  Paolo Abeni <pabeni@...hat.com>,  "open list:MAC80211"
 <linux-wireless@...r.kernel.org>,  "open list:NETWORKING [GENERAL]"
 <netdev@...r.kernel.org>,  open list <linux-kernel@...r.kernel.org>,  Jun
 Ma <Jun.ma2@....com>
Subject: Re: [PATCH] wifi: mac80211: Use subsystem appropriate debug call

"Ma, Jun" <majun@....com> writes:

> Hi,
>
> On 12/18/2023 11:17 PM, Kalle Valo wrote:
>> Mario Limonciello <mario.limonciello@....com> writes:
>> 
>>> mac80211 doesn't use dev_dbg() but instead various macros from
>>> net/mac80211/debug.h. Adjust wbrf code to use wiphy_dbg() instead.
>>>
>>> Cc: Jun Ma <Jun.ma2@....com>
>>> Reported-by: kvalo@...nel.org
>>> Closes:
>>> https://lore.kernel.org/amd-gfx/8bd60010-7534-4c22-9337-c4219946d8d6@amd.com/T/#mfe2f29372c45130d27745912faf33d9f7ce50118
>>> Fixes: d34be4310cbe ("wifi: mac80211: Add support for WBRF features")
>>> Signed-off-by: Mario Limonciello <mario.limonciello@....com>
>>> ---
>>>  net/mac80211/wbrf.c | 4 ++--
>>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/net/mac80211/wbrf.c b/net/mac80211/wbrf.c
>>> index a05c5b971789..12c23e14f884 100644
>>> --- a/net/mac80211/wbrf.c
>>> +++ b/net/mac80211/wbrf.c
>>> @@ -23,8 +23,8 @@ void ieee80211_check_wbrf_support(struct ieee80211_local *local)
>>>  		return;
>>>  
>>>  	local->wbrf_supported = acpi_amd_wbrf_supported_producer(dev);
>>> -	dev_dbg(dev, "WBRF is %s supported\n",
>>> -		local->wbrf_supported ? "" : "not");
>>> +	wiphy_dbg(wiphy, "WBRF is %s supported\n",
>>> +		  local->wbrf_supported ? "" : "not");
>>>  }
>> 
>> This won't work, I still see the debug message:
>> 
>> [  333.765867] ieee80211 phy0: WBRF is not supported
>> 
>> The issue seems to be that mac80211 defines DEBUG in
>> net/mac80211/Makefile:
>> 
>> ccflags-y += -DDEBUG
>> 
>> That -DDEBUG should be cleaned up, but I think separately. It's just
>> that I cannot come up with any good proposal, all the macros in
>> net/mac80211/debug.h require sdata and we don't have that in this stage.
>> Any ideas?
>
> I will submit a patch that only compiles wbrf.c when CONFIG_AMD_WBRF=y

But does this mean that the debug is still printed when CONFIG_AMD_WBRF
is enabled? And I would assume all distros enable that, right?

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