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    SubjectRe: [PATCH 1/6] add symbol value to help find the real depend
    Cheng Renquan writes:
    > From: Cheng Renquan <crquan@gmail.com>
    >
    > kbuild-menuconfig-display-depend-value.patch
    >
    > Sometimes when configuring need to disable some unused item, but the item is
    > selected by many other items, it's hard to find the real dependency which
    > selected it, This patch add every symbol's value accompanied to make it
    > possible to find the real dependency easily.
    >
    > An example is CONFIG_RFKILL,
    >
    > ---------------------- RF switch subsystem support ----------------------
    > | CONFIG_RFKILL: |
    > | |
    > | Say Y here if you want to have control over RF switches |
    > | found on many WiFi and Bluetooth cards. |
    > | |
    > | To compile this driver as a module, choose M here: the |
    > | module will be called rfkill. |
    > | |
    > | Symbol: RFKILL [=m] |
    > | Prompt: RF switch subsystem support |
    > | Defined at net/rfkill/Kconfig:4 |
    > | Depends on: NET [=y] |
    > | Location: |
    > | -> Networking support (NET [=y]) |
    > | Selected by: IWLCORE [=n] && NETDEVICES [=y] && !S390 [=S390] && PC |
    > | |
    > ----------------------------------------------------------------( 99%)---

    I like this concept, but I'd like to see it supported with make oldconfig.
    Let's say I copy a .config from kernel X into kernel Y (Y>X) and make oldconfig.
    Sometimes the new kernel will enable some previously disabled option, and
    it would be very useful to see WHY.

    To take a concrete example, in my 2.6.30 .config I had:

    CONFIG_DRM=m
    CONFIG_DRM_RADEON=m
    # CONFIG_FB is not set

    which when oldconfig'd in 2.6.31-rc changed to

    CONFIG_DRM=m
    CONFIG_DRM_RADEON=m
    CONFIG_FB=m
    (+ some more FB stuff)

    In this case it would have been nice to get an explanation that DRM_RADEON
    was responsible for (wrongly, IMO) selecting FB. Something like

    # CONFIG_FB was selected by CONFIG_DRM_RADEON
    CONFIG_FB=m

    These comments should only be emitted for options added by select that
    previously were absent or 'is not set'.

    /Mikael


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