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If CONFIG_MMC=m and CONFIG_WFX=y, compilation complains with undefined
references:
drivers/staging/wfx/main.o: In function `wfx_core_init': /linux/drivers/staging/wfx/main.c:488: undefined reference to `sdio_register_driver'
drivers/staging/wfx/main.o: In function `wfx_core_exit': /linux/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'
Indeed, symbols sdio_* are not present in kernel image.
This patch disallows CONFIG_WFX=y if CONFIG_MMC=m.
This solution impacts users who want to use SPI bus with configuration:
CONFIG_WFX=y + CONFIG_SPI=y + CONFIG_MMC=m. However, I think this is a
twisted case. So, I think it won't be missed.
Reported-by: zhong jiang <zhongjiang@huawei.com>
Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20191017093954.657-3-Jerome.Pouiller@silabs.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8008d9e7dd