linux-kernel - Re: [PATCH v2 01/30] pm: Improve EXPORT_*_DEV_PM

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Date:   Mon, 26 Sep 2022 15:35:35 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Paul Cercueil <paul@...pouillou.net>,
        Jonathan Cameron <jic23@...nel.org>
Cc:     Lee Jones <lee.jones@...aro.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-pm <linux-pm@...r.kernel.org>
Subject: Re: [PATCH v2 01/30] pm: Improve EXPORT_*_DEV_PM_OPS macros

On Mon, Sep 26, 2022 at 3:27 PM Paul Cercueil <paul@...pouillou.net> wrote:
>
> Hi,
>
> Le lun., sept. 26 2022 at 14:00:52 +0200, Rafael J. Wysocki
> <rafael@...nel.org> a écrit :
> > On Sun, Sep 25, 2022 at 4:52 PM Jonathan Cameron <jic23@...nel.org>
> > wrote:
> >>
> >>  On Thu, 25 Aug 2022 23:42:53 +0100
> >>  Paul Cercueil <paul@...pouillou.net> wrote:
> >>
> >>  > Hi Rafael,
> >>  >
> >>  > Le mar., août 23 2022 at 19:47:57 +0200, Rafael J. Wysocki
> >>  > <rafael@...nel.org> a écrit :
> >>  > > On Mon, Aug 8, 2022 at 7:41 PM Paul Cercueil
> >> <paul@...pouillou.net>
> >>  > > wrote:
> >>  > >>
> >>  > >>  Update the _EXPORT_DEV_PM_OPS() internal macro. It was not
> >> used
> >>  > >> anywhere
> >>  > >>  outside pm.h and pm_runtime.h, so it is safe to update it.
> >>  > >>
> >>  > >>  Before, this macro would take a few parameters to be used as
> >> sleep
> >>  > >> and
> >>  > >>  runtime callbacks. This made it unsuitable to use with
> >> different
> >>  > >>  callbacks, for instance the "noirq" ones.
> >>  > >>
> >>  > >>  It is now semantically different: instead of creating a
> >>  > >> conditionally
> >>  > >>  exported dev_pm_ops structure, it only contains part of the
> >>  > >> definition.
> >>  > >>
> >>  > >>  This macro should however never be used directly (hence the
> >> trailing
> >>  > >>  underscore). Instead, the following four macros are provided:
> >>  > >>  - EXPORT_DEV_PM_OPS(name)
> >>  > >>  - EXPORT_GPL_DEV_PM_OPS(name)
> >>  > >>  - EXPORT_NS_DEV_PM_OPS(name, ns)
> >>  > >>  - EXPORT_NS_GPL_DEV_PM_OPS(name, ns)
> >>  > >>
> >>  > >>  For instance, it is now possible to conditionally export noirq
> >>  > >>  suspend/resume PM functions like this:
> >>  > >>
> >>  > >>  EXPORT_GPL_DEV_PM_OPS(foo_pm_ops) = {
> >>  > >>      NOIRQ_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn)
> >>  > >>  };
> >>  > >>
> >>  > >>  The existing helper macros EXPORT_*_SIMPLE_DEV_PM_OPS() and
> >>  > >>  EXPORT_*_RUNTIME_DEV_PM_OPS() have been updated to use these
> >> new
> >>  > >> macros.
> >>  > >>
> >>  > >>  Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> >>  > >
> >>  > > Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> >>  > >
> >>  > > or please let me know if you need me to pick up this one.
> >>  >
> >>  > Could you pick this one up then, and make a branch for Jonathan?
> >>
> >>  Hi Paul, Rafael,
> >>
> >>  What happened to this in the end?  I can't immediately find it on
> >>  any of the pm git tree branches.
> >>
> >>  At this stage in the cycle it would be great if this patch at least
> >>  makes the merge window, so we can make use of it next cycle.
> >
> > I thought that this would go in along with the other patches in the
> > series.
> >
> > I can apply it directly, though, if needed.
> >
> > Thanks!
>
> I think at this point Jonathan can just take it in his tree with his
> own patchset. Then I'll rebase this patchset on v6.1-rc1.

Sure.

Jonathan, please go ahead and take the patch directly.