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Re: [PATCH 1/4] kconfig: introduce the "imply" keyword

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On 20/10/16 00:42, Nicolas Pitre wrote:
> diff --git a/Documentation/kbuild/kconfig-language.txt b/Documentation/kbuild/kconfig-language.txt
> index 069fcb3eef..c96127f648 100644
> --- a/Documentation/kbuild/kconfig-language.txt
> +++ b/Documentation/kbuild/kconfig-language.txt
> @@ -113,6 +113,33 @@ applicable everywhere (see syntax).
>  	That will limit the usefulness but on the other hand avoid
>  	the illegal configurations all over.
>  
> +- weak reverse dependencies: "imply" <symbol> ["if" <expr>]
> +  This is similar to "select" as it enforces a lower limit on another
> +  symbol except that the "implied" config symbol's value may still be
> +  set to n from a direct dependency or with a visible prompt.
> +  Given the following example:
> +
> +  config FOO
> +	tristate
> +	imply BAZ
> +
> +  config BAZ
> +	tristate
> +	depends on BAr
> +
> +  The following values are possible:
> +
> +	FOO		BAR		BAR's default	choice for BAZ
Should the third column not be "BAZ's default"?
> +	---------------	---------------	---------------	--------------
> +	n		y		n		N/m/y
> +	m		y		m		M/y/n
> +	y		y		y		Y/n
> +	y		n		*		N
Also, I don't think having any FOO=y should preclude BAZ=m.  Suppose both
FOO and FOO2 imply BAZ, FOO=y and FOO2=m.  Then if BAZ-features are only
desired for driver FOO2, BAz=m makes sense.
There is also the case of drivers with the ability to detect at runtime
whether BAZ is present, rather than making the decision at build time, but
I'm not sure how common that is.

-Ed

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[PATCH 0/4] make POSIX timers optional with some Kconfig help Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-10-20 01:50 +0200
  [PATCH 3/4] ptp_clock: allow for it to be optional Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-10-20 01:50 +0200
    Re: [PATCH 3/4] ptp_clock: allow for it to be optional Thomas Gleixner <tglx@linutronix.de> - 2016-10-20 12:00 +0200
      Re: [PATCH 3/4] ptp_clock: allow for it to be optional Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-10-20 19:50 +0200
        Re: [PATCH 3/4] ptp_clock: allow for it to be optional Thomas Gleixner <tglx@linutronix.de> - 2016-10-20 20:10 +0200
    Re: [PATCH 3/4] ptp_clock: allow for it to be optional Richard Cochran <richardcochran@gmail.com> - 2016-10-20 16:10 +0200
      Re: [PATCH 3/4] ptp_clock: allow for it to be optional Josh Triplett <josh@joshtriplett.org> - 2016-10-20 17:50 +0200
      Re: [PATCH 3/4] ptp_clock: allow for it to be optional Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-10-20 18:50 +0200
  [PATCH 1/4] kconfig: introduce the "imply" keyword Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-10-20 01:50 +0200
    Re: [PATCH 1/4] kconfig: introduce the "imply" keyword Masahiro Yamada <yamada.masahiro@socionext.com> - 2016-10-20 09:00 +0200
    Re: [PATCH 1/4] kconfig: introduce the "imply" keyword Edward Cree <ecree@solarflare.com> - 2016-10-20 17:00 +0200
      Re: [PATCH 1/4] kconfig: introduce the "imply" keyword Josh Triplett <josh@joshtriplett.org> - 2016-10-20 17:50 +0200
      Re: [PATCH 1/4] kconfig: introduce the "imply" keyword Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-10-20 19:10 +0200
        Re: [PATCH 1/4] kconfig: introduce the "imply" keyword Edward Cree <ecree@solarflare.com> - 2016-10-20 19:50 +0200
          Re: [PATCH 1/4] kconfig: introduce the "imply" keyword Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-10-20 20:30 +0200
            Re: [PATCH 1/4] kconfig: introduce the "imply" keyword Edward Cree <ecree@solarflare.com> - 2016-10-20 21:20 +0200
              Re: [PATCH 1/4] kconfig: introduce the "imply" keyword Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-10-20 22:20 +0200
                Re: [PATCH 1/4] kconfig: introduce the "imply" keyword Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-10-21 05:30 +0200
  [PATCH 4/4] posix-timers: make it configurable Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-10-20 01:50 +0200
    Re: [PATCH 4/4] posix-timers: make it configurable Richard Cochran <richardcochran@gmail.com> - 2016-10-20 16:10 +0200
      Re: [PATCH 4/4] posix-timers: make it configurable Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-10-20 18:50 +0200
  Re: [PATCH 0/4] make POSIX timers optional with some Kconfig help Thomas Gleixner <tglx@linutronix.de> - 2016-10-20 11:50 +0200
    Re: [PATCH 0/4] make POSIX timers optional with some Kconfig help Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-10-20 20:40 +0200
  Re: [PATCH 0/4] make POSIX timers optional with some Kconfig help Josh Triplett <josh@joshtriplett.org> - 2016-10-20 21:00 +0200

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