On Mon, Jul 26, 2021 at 12:29 PM kernel test robot <lkp@intel.com> wrote:

> >> drivers/i2c/Kconfig:8:error: recursive dependency detected!
>    drivers/i2c/Kconfig:8: symbol I2C is selected by IGB
>    drivers/net/ethernet/intel/Kconfig:87: symbol IGB depends on PTP_1588_CLOCK
>    drivers/ptp/Kconfig:8: symbol PTP_1588_CLOCK is implied by MLX4_EN
>    drivers/net/ethernet/mellanox/mlx4/Kconfig:6: symbol MLX4_EN depends on NET_VENDOR_MELLANOX
>    drivers/net/ethernet/mellanox/Kconfig:6: symbol NET_VENDOR_MELLANOX depends on I2C
>    For a resolution refer to Documentation/kbuild/kconfig-language.rst
>    subsection "Kconfig recursive dependency limitations"

Sorry about this, the patch I was testing with has this additional hunk

@@ -88,7 +88,7 @@ config IGB
        tristate "Intel(R) 82575/82576 PCI-Express Gigabit Ethernet support"
        depends on PCI
        depends on PTP_1588_CLOCK || !PTP_1588_CLOCK
-       select I2C
+       depends on I2C
        select I2C_ALGOBIT
        help
          This driver supports Intel(R) 82575/82576 gigabit ethernet family of

that I even describe in the changelog but forgot to include in the patch I sent.

        Arnd