linux-kernel - Re: [PATCH v2] driver core: Add CONFIG_FW_DEVLINK_SYNC_STATE

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Date:   Fri, 17 Mar 2023 10:05:45 -0700
From:   Saravana Kannan <saravanak@...gle.com>
To:     Doug Anderson <dianders@...omium.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>, kernel-team@...roid.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] driver core: Add CONFIG_FW_DEVLINK_SYNC_STATE_TIMEOUT

On Fri, Mar 17, 2023 at 9:57 AM Doug Anderson <dianders@...omium.org> wrote:
>
> Hi,
>
> On Fri, Mar 17, 2023 at 7:12 AM Greg Kroah-Hartman
> <gregkh@...uxfoundation.org> wrote:
> >
> > On Tue, Mar 14, 2023 at 06:07:31PM -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 | 12 ++++++++++++
> > >  drivers/base/core.c  |  5 +++++
> > >  2 files changed, 17 insertions(+)
> > >
> > > diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig
> > > index 6f04b831a5c0..aac247512d69 100644
> > > --- a/drivers/base/Kconfig
> > > +++ b/drivers/base/Kconfig
> > > @@ -230,4 +230,16 @@ config GENERIC_ARCH_NUMA
> > >         Enable support for generic NUMA implementation. Currently, RISC-V
> > >         and ARM64 use it.
> > >
> > > +config FW_DEVLINK_SYNC_STATE_TIMEOUT
> > > +     bool
> > > +     help
> > > +       This is build time equivalent of adding kernel command line 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. You should almost always want to
> > > +       select N here unless you have already successfully tested with the
> > > +       command line option on every system/board your kernel is expected to
> > > +       work on.
> >
> > As nothing can actually select this, it doesn't make sense to add this
> > now, right?  We need a user, otherwise the automated tools will come
> > along and remove this option when they figure out that it can't be ever
> > used.
>
> I think the hope was that it could be setup as a config that would
> show up as user selectable (like in menuconfig). Saravana: the problem
> is your bare "bool" above. That should be changed to a description
> shown to the user. Like maybe you'd want to change that to:
>
>   bool "sync_state behavior defaults to timeout instead of strict"

Ah, thanks. Will do this.

-Saravana