Re: [PATCH 4/5] kconfig: Introduce "showif" to factor out conditions on visibility

[Paul Bolle]

On Wed, 2015-05-20 at 11:30 -0700, josh@xxxxxxxxxxxxxxxx wrote:
> In net/rfkill/Kconfig, RFKILL_REGULATOR oddly has
> "depends on RFKILL || !RFKILL".  WIMAX does the same thing.

That's only tristate logic. It's a common idiom, but it looks very odd
compared to boolean logic. It ensures RFKILL_REGULATOR will not be 'y'
if RFKILL is 'm'. Because:
    RFKILL = 'n' => RFKILL_REGULATOR = 'n' || 'm' || 'y'
    RFKILL = 'm' => RFKILL_REGULATOR = 'n' || 'm'
    RFKILL = 'y' => RFKILL_REGULATOR = 'n' || 'm' || 'y'

Hope this helps,


Paul Bolle

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