linux-kernel - Re: [PATCH v3] staging: wfx: fix an undefined reference error when CONFIG

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Date:   Sun, 13 Oct 2019 22:17:42 +0800
From:   zhong jiang <zhongjiang@...wei.com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     <Jerome.Pouiller@...abs.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] staging: wfx: fix an undefined reference error when
 CONFIG_MMC=m

On 2019/10/12 23:32, Greg KH wrote:
> On Sat, Oct 12, 2019 at 06:54:53PM +0800, zhong jiang wrote:
>> I hit the following error when compile the kernel.
>>
>> drivers/staging/wfx/main.o: In function `wfx_core_init':
>> /home/z00352263/linux-next/linux-next/drivers/staging/wfx/main.c:488: undefined reference to `sdio_register_driver'
>> drivers/staging/wfx/main.o: In function `wfx_core_exit':
>> /home/z00352263/linux-next/linux-next/drivers/staging/wfx/main.c:496: undefined reference to `sdio_unregister_driver'
>> drivers/staging/wfx/main.o:(.debug_addr+0x1a8): undefined reference to `sdio_register_driver'
>> drivers/staging/wfx/main.o:(.debug_addr+0x6f0): undefined reference to `sdio_unregister_driver'
>>
>> Signed-off-by: zhong jiang <zhongjiang@...wei.com>
>> ---
>> v2->v3:
>>     We'd better not use #ifdef in .c file to use IS_ENABLED instead.
>>
>> v1->v2:
>>     We should prefer to current dependencies rather than force to enable. 
>>
>>  drivers/staging/wfx/Makefile | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/staging/wfx/Makefile b/drivers/staging/wfx/Makefile
>> index 0d9c1ed..77d68b7 100644
>> --- a/drivers/staging/wfx/Makefile
>> +++ b/drivers/staging/wfx/Makefile
>> @@ -19,6 +19,6 @@ wfx-y := \
>>  	sta.o \
>>  	debug.o
>>  wfx-$(CONFIG_SPI) += bus_spi.o
>> -wfx-$(subst m,y,$(CONFIG_MMC)) += bus_sdio.o
>> +wfx-$(CONFIG_MMC) += bus_sdio.o
>>  
>>  obj-$(CONFIG_WFX) += wfx.o
> How does this change any of the existing logic?  What does this really
> change to solve the issue?  I thought you were going to fix this up as I
> suggested in my last email?
Yep,  It's my stupid fault.  I disable the CONFIG_SPI to test the issue.  :-(

Thanks,
zhong jiang
> thanks,
>
> greg k-h
>
> .
>