commit d2ae2e20fbdde5a65f3a5a153044ab1e5c53f7cc ("driver/memory:Move Freescale IFC driver to a common driver") introduces this build regression into the mpc85xx_defconfig: drivers/built-in.o: In function `fsl_ifc_nand_remove': drivers/mtd/nand/fsl_ifc_nand.c:1147: undefined reference to `fsl_ifc_ctrl_dev' drivers/mtd/nand/fsl_ifc_nand.c:1147: undefined reference to `fsl_ifc_ctrl_dev' drivers/built-in.o: In function `fsl_ifc_nand_probe': drivers/mtd/nand/fsl_ifc_nand.c:1031: undefined reference to `fsl_ifc_ctrl_dev' drivers/mtd/nand/fsl_ifc_nand.c:1031: undefined reference to `fsl_ifc_ctrl_dev' drivers/built-in.o: In function `match_bank': drivers/mtd/nand/fsl_ifc_nand.c:1013: undefined reference to `convert_ifc_address' drivers/built-in.o: In function `fsl_ifc_nand_probe': drivers/mtd/nand/fsl_ifc_nand.c:1059: undefined reference to `fsl_ifc_ctrl_dev' drivers/mtd/nand/fsl_ifc_nand.c:1080: undefined reference to `fsl_ifc_ctrl_dev' drivers/mtd/nand/fsl_ifc_nand.c:1069: undefined reference to `fsl_ifc_ctrl_dev' drivers/mtd/nand/fsl_ifc_nand.c:1069: undefined reference to `fsl_ifc_ctrl_dev' make: *** [vmlinux] Error 1 This happens because there is nothing to descend us into the drivers/memory directory in the mpc85xx_defconfig. It wasn't selecting CONFIG_MEMORY. So we never built drivers/memory/fsl_ifc.o even with CONFIG_FSL_IFC=y, and so we have nothing to link against. In order to remain compatible with old config files and to avoid such build failures, make CONFIG_FSL_IFC select CONFIG_MEMORY. Also fix the whitespace issue (spaces vs. a tab) in the Kconfig. Cc: Prabhakar Kushwaha <prabhakar@xxxxxxxxxxxxx> Cc: Arnd Bergmann <arnd@xxxxxxxx> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Paul Gortmaker <paul.gortmaker@xxxxxxxxxxxxx> --- [This probably makes sense to go in via Greg's char-misc/char-misc-next (vs. powerpc-next) since that is where the regression was introduced.] arch/powerpc/Kconfig | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 957bf344c0f5..d2d8d8f50610 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -738,7 +738,8 @@ config FSL_LBC config FSL_IFC bool - depends on FSL_SOC + depends on FSL_SOC + select MEMORY config FSL_GTM bool -- 1.8.5.2 -- To unsubscribe from this list: send the line "unsubscribe linux-next" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html