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

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Date:   Thu, 17 Sep 2020 12:38:47 -0700
From:   Jacob Keller <jacob.e.keller@...el.com>
To:     Leon Romanovsky <leonro@...dia.com>,
        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 9/17/2020 12:16 AM, Leon Romanovsky wrote:
> 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
> 

Seems like the more appropriate fix is to include the right header so
that these functions do have prototypes.