RE: [PATCH] spi: spi-mem: Fix build error without CONFIG_SPI_MEM

[Naga Sureshkumar Relli <nagasure@xxxxxxxxxx>]

Hi Vignesh,

> -----Original Message-----
> From: linux-spi-owner@xxxxxxxxxxxxxxx <linux-spi-owner@xxxxxxxxxxxxxxx> On Behalf Of
> YueHaibing
> Sent: Wednesday, April 10, 2019 9:03 AM
> To: Vignesh Raghavendra <vigneshr@xxxxxx>; broonie@xxxxxxxxxx; Naga Sureshkumar Relli
> <nagasure@xxxxxxxxxx>
> Cc: linux-kernel@xxxxxxxxxxxxxxx; linux-spi@xxxxxxxxxxxxxxx
> 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@xxxxxxxxxx>
> >>
> >> 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@xxxxxxxxxx>
> >> ---
> >>  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!
If we declare this as static inline, then we can't access that in zynq-qspi driver.
This is the error I am getting.
In file included from drivers/spi/spi-zynq-qspi.c:19:0:
./include/linux/spi/spi-mem.h:298:20: warning: ‘spi_mem_default_supports_op’ used but never defined
 static inline bool spi_mem_default_supports_op(struct spi_mem *mem,
                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/spi/spi-zynq-qspi.c: In function ‘zynq_qspi_supports_op’:
./include/linux/spi/spi-mem.h:298:20: error: inlining failed in call to always_inline ‘spi_mem_default_supports_op’: function body not available
drivers/spi/spi-zynq-qspi.c:223:7: note: called from here
  if (!spi_mem_default_supports_op(mem, op))

Thanks,
Naga Sureshkumar Relli
> 
> >
> >> +{
> >> +	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)
> >>
> >>
> >