linux-kernel - Re: [PATCH] ptp: mark symbols static where possible

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Message-ID: <20200917071605.GQ486552@unreal>
Date:   Thu, 17 Sep 2020 10:16:05 +0300
From:   Leon Romanovsky <leonro@...dia.com>
To:     Herrington <hankinsea@...il.com>
Cc:     Richard Cochran <richardcochran@...il.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ptp: mark symbols static where possible

On Thu, Sep 17, 2020 at 10:25:08AM +0800, Herrington wrote:
> We get 1 warning when building kernel with W=1:
> drivers/ptp/ptp_pch.c:182:5: warning: no previous prototype for ‘pch_ch_control_read’ [-Wmissing-prototypes]
>  u32 pch_ch_control_read(struct pci_dev *pdev)
> drivers/ptp/ptp_pch.c:193:6: warning: no previous prototype for ‘pch_ch_control_write’ [-Wmissing-prototypes]
>  void pch_ch_control_write(struct pci_dev *pdev, u32 val)
> drivers/ptp/ptp_pch.c:201:5: warning: no previous prototype for ‘pch_ch_event_read’ [-Wmissing-prototypes]
>  u32 pch_ch_event_read(struct pci_dev *pdev)
> drivers/ptp/ptp_pch.c:212:6: warning: no previous prototype for ‘pch_ch_event_write’ [-Wmissing-prototypes]
>  void pch_ch_event_write(struct pci_dev *pdev, u32 val)
> drivers/ptp/ptp_pch.c:220:5: warning: no previous prototype for ‘pch_src_uuid_lo_read’ [-Wmissing-prototypes]
>  u32 pch_src_uuid_lo_read(struct pci_dev *pdev)
> drivers/ptp/ptp_pch.c:231:5: warning: no previous prototype for ‘pch_src_uuid_hi_read’ [-Wmissing-prototypes]
>  u32 pch_src_uuid_hi_read(struct pci_dev *pdev)
> drivers/ptp/ptp_pch.c:242:5: warning: no previous prototype for ‘pch_rx_snap_read’ [-Wmissing-prototypes]
>  u64 pch_rx_snap_read(struct pci_dev *pdev)
> drivers/ptp/ptp_pch.c:259:5: warning: no previous prototype for ‘pch_tx_snap_read’ [-Wmissing-prototypes]
>  u64 pch_tx_snap_read(struct pci_dev *pdev)
> drivers/ptp/ptp_pch.c:300:5: warning: no previous prototype for ‘pch_set_station_address’ [-Wmissing-prototypes]
>  int pch_set_station_address(u8 *addr, struct pci_dev *pdev)
>
> Signed-off-by: Herrington <hankinsea@...il.com>
> ---
>  drivers/ptp/ptp_pch.c | 18 +++++++++---------
>  1 file changed, 9 insertions(+), 9 deletions(-)

This file is total mess.

>
> diff --git a/drivers/ptp/ptp_pch.c b/drivers/ptp/ptp_pch.c
> index ce10ecd41ba0..8db2d1893577 100644
> --- a/drivers/ptp/ptp_pch.c
> +++ b/drivers/ptp/ptp_pch.c
> @@ -179,7 +179,7 @@ static inline void pch_block_reset(struct pch_dev *chip)
>  	iowrite32(val, (&chip->regs->control));
>  }
>
> -u32 pch_ch_control_read(struct pci_dev *pdev)
> +static u32 pch_ch_control_read(struct pci_dev *pdev)
>  {
>  	struct pch_dev *chip = pci_get_drvdata(pdev);
>  	u32 val;
> @@ -190,7 +190,7 @@ u32 pch_ch_control_read(struct pci_dev *pdev)
>  }
>  EXPORT_SYMBOL(pch_ch_control_read);

This function is not used and can be deleted.

>
> -void pch_ch_control_write(struct pci_dev *pdev, u32 val)
> +static void pch_ch_control_write(struct pci_dev *pdev, u32 val)
>  {
>  	struct pch_dev *chip = pci_get_drvdata(pdev);
>
> @@ -198,7 +198,7 @@ void pch_ch_control_write(struct pci_dev *pdev, u32 val)
>  }
>  EXPORT_SYMBOL(pch_ch_control_write);


This function in use (incorrectly) by
drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c

Your patch will break it.

I didn't check other functions, but assume they are broken too.

Thanks