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Groups > linux.kernel > #1504412 > unrolled thread

[PATCH 0/4] make POSIX timers optional with some Kconfig help

Started byNicolas Pitre <nicolas.pitre@linaro.org>
First post2016-10-20 01:50 +0200
Last post2016-10-20 21:00 +0200
Articles 4 on this page of 24 — 6 participants

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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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#1505095 — Re: [PATCH 4/4] posix-timers: make it configurable

FromNicolas Pitre <nicolas.pitre@linaro.org>
Date2016-10-20 18:50 +0200
SubjectRe: [PATCH 4/4] posix-timers: make it configurable
Message-ID<suoHw-1G4-13@gated-at.bofh.it>
In reply to#1504915
On Thu, 20 Oct 2016, Richard Cochran wrote:

> On Wed, Oct 19, 2016 at 07:42:53PM -0400, Nicolas Pitre wrote:
> > +config POSIX_TIMERS
> > +	bool "Posix Clocks & timers" if EXPERT
> > +	default y
> > +	help
> > +	  This includes native support for POSIX timers to the kernel.
> > +	  Most embedded systems may have no use for them and therefore they
> 
> This sentence doesn't make sense.  How about:
> 
> 	  Some embedded systems have no use for them ...

As you wish.

Turns out that my own use of Fedora currently makes no use of them 
either.


Nicolas

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#1504720

FromThomas Gleixner <tglx@linutronix.de>
Date2016-10-20 11:50 +0200
Message-ID<sui93-5JM-15@gated-at.bofh.it>
In reply to#1504412
On Wed, 19 Oct 2016, Nicolas Pitre wrote:
> Therefore this series also includes kconfig changes to implement a new
> keyword to express some reverse dependencies like "select" does, named
> "imply", and still allowing for the target config symbol to be disabled
> if the user or a direct dependency says so.

That's really nice work! Thanks for doing that. It makes the whole thing
more palatable.

Thanks,

	tglx

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#1505179

FromNicolas Pitre <nicolas.pitre@linaro.org>
Date2016-10-20 20:40 +0200
Message-ID<suqpX-2Pv-27@gated-at.bofh.it>
In reply to#1504720
On Thu, 20 Oct 2016, Thomas Gleixner wrote:

> On Wed, 19 Oct 2016, Nicolas Pitre wrote:
> > Therefore this series also includes kconfig changes to implement a new
> > keyword to express some reverse dependencies like "select" does, named
> > "imply", and still allowing for the target config symbol to be disabled
> > if the user or a direct dependency says so.
> 
> That's really nice work! Thanks for doing that. It makes the whole thing
> more palatable.

Thanks.

Now I'd need some review tags...  ;-)


Nicolas

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#1505189

FromJosh Triplett <josh@joshtriplett.org>
Date2016-10-20 21:00 +0200
Message-ID<suqJk-2WR-15@gated-at.bofh.it>
In reply to#1504412
On Wed, Oct 19, 2016 at 07:42:49PM -0400, Nicolas Pitre wrote:
> Many embedded systems don't need the full POSIX timer support.
> Configuring them out provides a nice kernel image size reduction.
> 
> When POSIX timers are configured out, the PTP clock subsystem should be
> left out as well. However a bunch of ethernet drivers currently *select*
> the later in their Kconfig entries. Therefore some more work was needed
> to break that hard dependency from those drivers without preventing their
> usage altogether.
> 
> Therefore this series also includes kconfig changes to implement a new
> keyword to express some reverse dependencies like "select" does, named
> "imply", and still allowing for the target config symbol to be disabled
> if the user or a direct dependency says so.
> 
> How to deal with the dependencies across three subsystems for potential
> upstream merging needs to be figured out.

This looks good to me, and I like the new "imply" approach.

I'd still like to see a more general solution for reporting the use of
compiled-out syscalls, but I don't think that needs to block this patch
series.

Reviewed-by: Josh Triplett <josh@joshtriplett.org>

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