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

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Message-ID: <20191012153245.GA2155778@kroah.com>
Date:   Sat, 12 Oct 2019 17:32:45 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     zhong jiang <zhongjiang@...wei.com>
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 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?

thanks,

greg k-h