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Date:   Wed, 5 Oct 2022 07:23:57 +0900
From:   Akira Yokosawa <>
To:     Jakub Kicinski <>,
        Johannes Berg <>
Subject: Re: doc warnings in *80211


On Date: Tue, 4 Oct 2022 07:26:46 -0700, Jakub Kicinski wrote:
> On Tue, 04 Oct 2022 09:51:07 +0200 Johannes Berg wrote:
>> > doing basic sanity checks before submitting the net-next PR I spotted
>> > that we have these warnings when building documentation on net-next:
>> > 
>> > Documentation/driver-api/80211/cfg80211:48: ./include/net/cfg80211.h:6960: WARNING: Duplicate C declaration, also defined at driver-api/80211/cfg80211:6924.
>> > Declaration is '.. c:function:: void cfg80211_rx_assoc_resp (struct net_device *dev, struct cfg80211_rx_assoc_resp *data)'.  
>> Hmm. That's interesting. I guess it cannot distinguish between the type
>> of identifier?
>> struct cfg80211_rx_assoc_resp vs. cfg80211_rx_assoc_resp()
>> Not sure what do about it - rename one of them?
>> > Documentation/driver-api/80211/mac80211:109: ./include/net/mac80211.h:5046: WARNING: Duplicate C declaration, also defined at driver-api/80211/mac80211:1065.
>> > Declaration is '.. c:function:: void ieee80211_tx_status (struct ieee80211_hw *hw, struct sk_buff *skb)'.  
>> Same here actually!
>> I don't think either of these is new.
> Thanks for checking!
> Adding linux-doc, but I presume Jon & co are aware if this is not new.

Yes, this is a known issue of Sphinx >=3.0, which prevents us to
bump required version of Sphinx from 2.4.x.

Link to a relevant mail from Mauro in the lore archive:

Note that the same warnings can be seen when a kernel-doc comment is
included from multiple .rst files under Documentation/ by accident.

Actually, Sphinx < 3.0 can not detect such true duplicates.

As far as I see, this issue still remains in the latest version of
Sphinx (5.2.3).


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