linux-kernel - Re: [PATCH v1] driver core: Add CONFIG_FW_DEVLINK_SYNC_STATE

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Date:   Tue, 14 Mar 2023 09:35:18 -0700
From:   Saravana Kannan <saravanak@...gle.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Doug Anderson <dianders@...omium.org>, kernel-team@...roid.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] driver core: Add CONFIG_FW_DEVLINK_SYNC_STATE_TIMEOUT

On Mon, Mar 13, 2023 at 11:12 PM Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>
> On Mon, Mar 13, 2023 at 04:27:19PM -0700, Saravana Kannan wrote:
> > Add a build time equivalent of fw_devlink.sync_state=timeout so that
> > board specific kernels could enable it and not have to deal with setting
> > or cluttering the kernel commandline.
> >
> > Cc: Doug Anderson <dianders@...omium.org>
> > Signed-off-by: Saravana Kannan <saravanak@...gle.com>
> > ---
> >  drivers/base/Kconfig | 10 ++++++++++
> >  drivers/base/core.c  |  5 +++++
> >  2 files changed, 15 insertions(+)
> >
> > diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig
> > index 6f04b831a5c0..da91b409482f 100644
> > --- a/drivers/base/Kconfig
> > +++ b/drivers/base/Kconfig
> > @@ -230,4 +230,14 @@ config GENERIC_ARCH_NUMA
> >         Enable support for generic NUMA implementation. Currently, RISC-V
> >         and ARM64 use it.
> >
> > +config FW_DEVLINK_SYNC_STATE_TIMEOUT
> > +     bool
> > +     default n
>
> n is always the default, no need to say it here again.

Ok, that's what I thought, but then I got confused by the other
default n in that file. I'll fix this.

>
> > +     help
> > +       This is build time equivalent of adding kernel commandline parameter
> > +       "fw_devlink.sync_state=timeout". Give up waiting on consumers and
> > +       call sync_state() on any devices that haven't yet received their
> > +       sync_state() calls after deferred_probe_timeout has expired or by
> > +       late_initcall() if !CONFIG_MODULES.
>
> I think you forgot a noun in this last sentence :)

Hmm... reads okay to me. I'm open to suggestions if you want to tell
me exactly what to put in here.

> And add something like "You should almost always want to select N here
> unless you have successfully tested with this command line option
> already"

Will do.

-Saravana