linux-kernel - Re: [PATCH] Bluetooth: btmtk: Fix btmtk.c undefined reference build error

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Message-ID: <933ef4f9500cb1e88c68f3e811a0df982c4089f9.camel@mediatek.com>
Date: Thu, 11 Jul 2024 00:46:03 +0000
From: Chris Lu (陸稚泓) <Chris.Lu@...iatek.com>
To: "luiz.dentz@...il.com" <luiz.dentz@...il.com>
CC: "marcel@...tmann.org" <marcel@...tmann.org>,
	"linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-bluetooth@...r.kernel.org" <linux-bluetooth@...r.kernel.org>,
	"johan.hedberg@...il.com" <johan.hedberg@...il.com>,
	Steve Lee (李視誠) <steve.lee@...iatek.com>, Sean Wang
	<Sean.Wang@...iatek.com>, Aaron Hou (侯俊仰)
	<Aaron.Hou@...iatek.com>
Subject: Re: [PATCH] Bluetooth: btmtk: Fix btmtk.c undefined reference build
 error

Hi Luiz,

On Wed, 2024-07-10 at 08:20 -0400, Luiz Augusto von Dentz wrote:
>  	 
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
>  Hi Chris,
> 
> On Wed, Jul 10, 2024 at 3:38 AM Chris Lu <chris.lu@...iatek.com>
> wrote:
> >
> > MediaTek move some usb interface related function to btmtk.c which
> > may cause build failed if BT USB Kconfig wasn't enabled.
> > Fix undefined reference by adding config check.
> >
> > Fixes: 39a9e1c69e74 Bluetooth: btmtk: move btusb_mtk_hci_wmt_sync
> to btmtk.c
> > Reported-by: kernel test robot <lkp@...el.com>
> > Closes: 
> https://lore.kernel.org/oe-kbuild-all/202407091928.AH0aGZnx-lkp@intel.com/
> > Signed-off-by: Chris Lu <chris.lu@...iatek.com>
> > ---
> >  drivers/bluetooth/btmtk.c | 2 ++
> >  drivers/bluetooth/btmtk.h | 4 ++++
> >  2 files changed, 6 insertions(+)
> >
> > diff --git a/drivers/bluetooth/btmtk.c b/drivers/bluetooth/btmtk.c
> > index b7c348687a77..9789296ad4f6 100644
> > --- a/drivers/bluetooth/btmtk.c
> > +++ b/drivers/bluetooth/btmtk.c
> > @@ -437,6 +437,7 @@ int btmtk_process_coredump(struct hci_dev
> *hdev, struct sk_buff *skb)
> >  }
> >  EXPORT_SYMBOL_GPL(btmtk_process_coredump);
> >
> > +#if IS_ENABLED(CONFIG_BT_HCIBTUSB_MTK)
> >  static void btmtk_usb_wmt_recv(struct urb *urb)
> >  {
> >         struct hci_dev *hdev = urb->context;
> > @@ -1487,6 +1488,7 @@ int btmtk_usb_shutdown(struct hci_dev *hdev)
> >         return 0;
> >  }
> >  EXPORT_SYMBOL_GPL(btmtk_usb_shutdown);
> > +#endif
> >
> >  MODULE_AUTHOR("Sean Wang <sean.wang@...iatek.com>");
> >  MODULE_AUTHOR("Mark Chen <mark-yw.chen@...iatek.com>");
> > diff --git a/drivers/bluetooth/btmtk.h b/drivers/bluetooth/btmtk.h
> > index 453ed5131a37..890dbe9beff8 100644
> > --- a/drivers/bluetooth/btmtk.h
> > +++ b/drivers/bluetooth/btmtk.h
> > @@ -165,6 +165,7 @@ struct btmtk_data {
> >         btmtk_reset_sync_func_t reset_sync;
> >         struct btmtk_coredump_info cd_info;
> >
> > +#if IS_ENABLED(CONFIG_BT_HCIBTUSB_MTK)
> >         struct usb_device *udev;
> >         struct usb_interface *intf;
> >         struct usb_anchor *ctrl_anchor;
> > @@ -177,6 +178,7 @@ struct btmtk_data {
> >
> >         /* spinlock for ISO data transmission */
> >         spinlock_t isorxlock;
> > +#endif
> 
> If I recall this correctly it is not a good practice to use #if
> inside
> structs as it would change its overall size, memory layout, etc, and
> it also makes it difficult to use if (IS_DEFINED) and let the
> compiler
> eliminate dead code instead of using the preprocessor like you doing.
> 
> 

"#if" can be remove here, usb.h was included in each c file in case 
making certain compiler error as you mentioned. It should be fine not
to separate these element. I'm able to build pass after remove the
"#if" here locally with same Kconfig.

I saw someone sent another patch for this issue by adding inline  to
each function. It would be another way to avoid undefined reference.


Thanks,
Chris Lu
> >  };
> >
> >  typedef int (*wmt_cmd_sync_func_t)(struct hci_dev *,
> > @@ -202,6 +204,7 @@ int btmtk_process_coredump(struct hci_dev
> *hdev, struct sk_buff *skb);
> >  void btmtk_fw_get_filename(char *buf, size_t size, u32 dev_id, u32
> fw_ver,
> >                            u32 fw_flavor);
> >
> > +#if IS_ENABLED(CONFIG_BT_HCIBTUSB_MTK)
> >  int btmtk_usb_subsys_reset(struct hci_dev *hdev, u32 dev_id);
> >
> >  int btmtk_usb_recv_acl(struct hci_dev *hdev, struct sk_buff *skb);
> > @@ -216,6 +219,7 @@ int btmtk_usb_suspend(struct hci_dev *hdev);
> >  int btmtk_usb_setup(struct hci_dev *hdev);
> >
> >  int btmtk_usb_shutdown(struct hci_dev *hdev);
> > +#endif
> >  #else
> >
> >  static inline int btmtk_set_bdaddr(struct hci_dev *hdev,
> > --
> > 2.18.0
> >
> 
> 
> -- 
> Luiz Augusto von Dentz