linux-kernel - Re: [PATCH v2 2/4] driver core: Set deferred probe timeout to 0 if modules are disabled

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Message-ID: <20221116163931.ob7szcnjx65c7gz7@halaney-x13s>
Date:   Wed, 16 Nov 2022 10:39:31 -0600
From:   Andrew Halaney <ahalaney@...hat.com>
To:     Javier Martinez Canillas <javierm@...hat.com>
Cc:     linux-kernel@...r.kernel.org,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Douglas Anderson <dianders@...omium.org>,
        Saravana Kannan <saravanak@...gle.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        linux-arm-msm@...r.kernel.org, John Stultz <jstultz@...gle.com>,
        Peter Robinson <pbrobinson@...hat.com>,
        Steev Klimaszewski <steev@...i.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Enric Balletbo i Serra <eballetbo@...hat.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Brian Masney <bmasney@...hat.com>,
        Rob Herring <robh@...nel.org>
Subject: Re: [PATCH v2 2/4] driver core: Set deferred probe timeout to 0 if
 modules are disabled

On Wed, Nov 16, 2022 at 01:00:43PM +0100, Javier Martinez Canillas wrote:
> There is no point to schedule the work queue to timeout the deferred probe
> if all the initcalls are done and modules are not enabled. The default for
> this case is already 0 but can be overridden by the deferred_probe_timeout
> parameter. Let's just disable to avoid queuing a work that is not needed.
> 
> Signed-off-by: Javier Martinez Canillas <javierm@...hat.com>
> ---
> 
> (no changes since v1)
> 
>  drivers/base/dd.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/base/dd.c b/drivers/base/dd.c
> index 040b4060f903..1e8f1afeac98 100644
> --- a/drivers/base/dd.c
> +++ b/drivers/base/dd.c
> @@ -350,8 +350,10 @@ static int deferred_probe_initcall(void)
>  	flush_work(&deferred_probe_work);
>  	initcalls_done = true;
>  
> -	if (!IS_ENABLED(CONFIG_MODULES))
> +	if (!IS_ENABLED(CONFIG_MODULES)) {
> +		driver_deferred_probe_timeout = 0;
>  		fw_devlink_drivers_done();
> +	}
>  

Potentially a stupid suggestion, but would it make sense to take out
the ability to actually set that param if !CONFIG_MODULES? Then
driver_deferred_probe_timeout would be the default value already.

>  	/*
>  	 * Trigger deferred probe again, this time we won't defer anything
> -- 
> 2.38.1
>