netdev - Re: [PATCH 3/3] mt76: mt7921: fix build regression

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Date:   Sat, 4 Dec 2021 18:51:54 +0100
From:   Felix Fietkau <nbd@....name>
To:     Arnd Bergmann <arnd@...nel.org>,
        Lorenzo Bianconi <lorenzo.bianconi83@...il.com>,
        Ryder Lee <ryder.lee@...iatek.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Sean Wang <sean.wang@...iatek.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Shayne Chen <shayne.chen@...iatek.com>,
        Soul Huang <Soul.Huang@...iatek.com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] mt76: mt7921: fix build regression

On 2021-12-04 18:38, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> After mt7921s got added, there are two possible build problems:
> 
> a) mt7921s does not get built at all if mt7921e is not also enabled
> 
> b) there is a link error when mt7921e is a loadable module, but mt7921s
> configured as built-in:
> 
> ERROR: modpost: "mt7921_mac_sta_add" [drivers/net/wireless/mediatek/mt76/mt7921/mt7921e.ko] undefined!
> ERROR: modpost: "mt7921_mac_sta_assoc" [drivers/net/wireless/mediatek/mt76/mt7921/mt7921e.ko] undefined!
> ERROR: modpost: "mt7921_mac_sta_remove" [drivers/net/wireless/mediatek/mt76/mt7921/mt7921e.ko] undefined!
> ERROR: modpost: "mt7921_mac_write_txwi" [drivers/net/wireless/mediatek/mt76/mt7921/mt7921e.ko] undefined!
> ERROR: modpost: "mt7921_mcu_drv_pmctrl" [drivers/net/wireless/mediatek/mt76/mt7921/mt7921e.ko] undefined!
> ERROR: modpost: "mt7921_mcu_fill_message" [drivers/net/wireless/mediatek/mt76/mt7921/mt7921e.ko] undefined!
> ERROR: modpost: "mt7921_mcu_parse_response" [drivers/net/wireless/mediatek/mt76/mt7921/mt7921e.ko] undefined!
> ERROR: modpost: "mt7921_ops" [drivers/net/wireless/mediatek/mt76/mt7921/mt7921e.ko] undefined!
> ERROR: modpost: "mt7921_queue_rx_skb" [drivers/net/wireless/mediatek/mt76/mt7921/mt7921e.ko] undefined!
> ERROR: modpost: "mt7921_update_channel" [drivers/net/wireless/mediatek/mt76/mt7921/mt7921e.ko] undefined!
> 
> Fix both by making sure that Kbuild enters the subdirectory when
> either one is enabled.
> 
> Fixes: 48fab5bbef40 ("mt76: mt7921: introduce mt7921s support")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
Acked-by: Felix Fietkau <nbd@....name>