unmet direct dependencies in -next

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Hi!

-next faces some build issues on UML because of unmet direct dependencies.
Mostly due to HAS_IOMEM and I2C.

warning: (MEDIA_SUBDRV_AUTOSELECT && VIDEO_CX231XX && INV_MPU6050_IIO) selects I2C_MUX which has unmet direct dependencies (I2C && HAS_IOMEM)
warning: (ST_IRQCHIP && HIP04_ETH && STMMAC_PLATFORM && DWMAC_IPQ806X && DWMAC_LPC18XX && DWMAC_ROCKCHIP && DWMAC_SOCFPGA && DWMAC_STI && TI_CPSW && PINCTRL_ROCKCHIP &&
PINCTRL_DOVE && POWER_RESET_KEYSTONE && POWER_RESET_SYSCON && POWER_RESET_SYSCON_POWEROFF && S3C2410_WATCHDOG && VIDEO_OMAP3 && VIDEO_S5P_FIMC && RTC_DRV_AT91SAM9 && VIDEO_OMAP4 &&
HWSPINLOCK_QCOM && ATMEL_ST && QCOM_GSBI) selects MFD_SYSCON which has unmet direct dependencies (HAS_IOMEM)
warning: (MEDIA_SUBDRV_AUTOSELECT && VIDEO_CX231XX && INV_MPU6050_IIO) selects I2C_MUX which has unmet direct dependencies (I2C && HAS_IOMEM)
warning: (ST_IRQCHIP && HIP04_ETH && STMMAC_PLATFORM && DWMAC_IPQ806X && DWMAC_LPC18XX && DWMAC_ROCKCHIP && DWMAC_SOCFPGA && DWMAC_STI && TI_CPSW && PINCTRL_ROCKCHIP &&
PINCTRL_DOVE && POWER_RESET_KEYSTONE && POWER_RESET_SYSCON && POWER_RESET_SYSCON_POWEROFF && S3C2410_WATCHDOG && VIDEO_OMAP3 && VIDEO_S5P_FIMC && RTC_DRV_AT91SAM9 && VIDEO_OMAP4 &&
HWSPINLOCK_QCOM && ATMEL_ST && QCOM_GSBI) selects MFD_SYSCON which has unmet direct dependencies (HAS_IOMEM)

For example MFD_SYSCON cannot build on UML as it depends on HAS_IOMEM.
While the symbol MFD_SYSCON has correct dependencies some users of MFD_SYSCON
just issue a "select MFD_SYSCON" and bypass the HAS_IOMEM dependency and causing the build to fail.

This brings me to a question on kconfig itself, wouldn't it be better to just disable a symbol if it has
unmet direct dependencies?

Thanks,
//richard
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