linux-kernel - Re: [PATCH] spi: spi-mem: Fix build error without CONFIG_SPI

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Date:   Wed, 10 Apr 2019 11:33:23 +0800
From:   YueHaibing <yuehaibing@...wei.com>
To:     Vignesh Raghavendra <vigneshr@...com>, <broonie@...nel.org>,
        <naga.sureshkumar.relli@...inx.com>
CC:     <linux-kernel@...r.kernel.org>, <linux-spi@...r.kernel.org>
Subject: Re: [PATCH] spi: spi-mem: Fix build error without CONFIG_SPI_MEM

On 2019/4/10 0:30, Vignesh Raghavendra wrote:
> On 08/04/19 8:09 PM, Yue Haibing wrote:
>> From: YueHaibing <yuehaibing@...wei.com>
>>
>> When building with CONFIG_SPI_MEM is not set
>> gc warns this:
>>
>> drivers/spi/spi-zynq-qspi.o: In function `zynq_qspi_supports_op':
>> spi-zynq-qspi.c:(.text+0x1da): undefined reference to `spi_mem_default_supports_op'
>>
>> Fixes: 67dca5e580f1 ("spi: spi-mem: Add support for Zynq QSPI controller")
>> Signed-off-by: YueHaibing <yuehaibing@...wei.com>
>> ---
>>  include/linux/spi/spi-mem.h | 14 +++++++++++---
>>  1 file changed, 11 insertions(+), 3 deletions(-)
>>
>> diff --git a/include/linux/spi/spi-mem.h b/include/linux/spi/spi-mem.h
>> index c845cd6..1941b84 100644
>> --- a/include/linux/spi/spi-mem.h
>> +++ b/include/linux/spi/spi-mem.h
>> @@ -295,6 +295,10 @@ int spi_controller_dma_map_mem_op_data(struct spi_controller *ctlr,
>>  void spi_controller_dma_unmap_mem_op_data(struct spi_controller *ctlr,
>>  					  const struct spi_mem_op *op,
>>  					  struct sg_table *sg);
>> +
>> +bool spi_mem_default_supports_op(struct spi_mem *mem,
>> +				 const struct spi_mem_op *op);
>> +
>>  #else
>>  static inline int
>>  spi_controller_dma_map_mem_op_data(struct spi_controller *ctlr,
>> @@ -310,6 +314,13 @@ spi_controller_dma_unmap_mem_op_data(struct spi_controller *ctlr,
>>  				     struct sg_table *sg)
>>  {
>>  }
>> +
>> +bool spi_mem_default_supports_op(struct spi_mem *mem,
>> +				 const struct spi_mem_op *op)
> 
> This needs to be declared static inline to avoid multiple definitions.
> Right?

Indeed, thanks!

> 
>> +{
>> +	return false;
>> +}
>> +
>>  #endif /* CONFIG_SPI_MEM */
>>  
>>  int spi_mem_adjust_op_size(struct spi_mem *mem, struct spi_mem_op *op);
>> @@ -341,9 +352,6 @@ int spi_mem_driver_register_with_owner(struct spi_mem_driver *drv,
>>  
>>  void spi_mem_driver_unregister(struct spi_mem_driver *drv);
>>  
>> -bool spi_mem_default_supports_op(struct spi_mem *mem,
>> -				 const struct spi_mem_op *op);
>> -
>>  #define spi_mem_driver_register(__drv)                                  \
>>  	spi_mem_driver_register_with_owner(__drv, THIS_MODULE)
>>  
>>
>