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

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Date:   Fri, 17 Mar 2023 15:12:40 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Saravana Kannan <saravanak@...gle.com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Doug Anderson <dianders@...omium.org>, kernel-team@...roid.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] driver core: Add CONFIG_FW_DEVLINK_SYNC_STATE_TIMEOUT

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.

thanks,

greg k-h