linux-kernel - Re: [PATCH v1] clocksource: Avoid creating dead devices

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Message-ID: <f9f3afa0-f0a7-6cff-2e57-e4e448a81a90@linaro.org>
Date:   Thu, 27 Feb 2020 10:06:37 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Saravana Kannan <saravanak@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     kernel-team@...roid.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] clocksource: Avoid creating dead devices

On 11/01/2020 06:21, Saravana Kannan wrote:
> Timer initialization is done during early boot way before the driver
> core starts processing devices and drivers. Timers initialized during
> this early boot period don't really need or use a struct device.
> 
> However, for timers represented as device tree nodes, the struct devices
> are still created and sit around unused and wasting memory. This change
> avoid this by marking the device tree nodes as "populated" if the
> corresponding timer is successfully initialized.
> 
> Signed-off-by: Saravana Kannan <saravanak@...gle.com>
> ---
>  drivers/clocksource/timer-probe.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/clocksource/timer-probe.c b/drivers/clocksource/timer-probe.c
> index ee9574da53c0..a10f28d750a9 100644
> --- a/drivers/clocksource/timer-probe.c
> +++ b/drivers/clocksource/timer-probe.c
> @@ -27,8 +27,10 @@ void __init timer_probe(void)
>  
>  		init_func_ret = match->data;
>  
> +		of_node_set_flag(np, OF_POPULATED);
>  		ret = init_func_ret(np);
>  		if (ret) {
> +			of_node_clear_flag(np, OF_POPULATED);

Isn't it in conflict with:

drivers/clocksource/ingenic-timer.c

?

>  			if (ret != -EPROBE_DEFER)
>  				pr_err("Failed to initialize '%pOF': %d\n", np,
>  				       ret);
> 


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