linux-kernel - Re: [Resend][PATCH] drivers/thermal: optimize the for circle to run a bit fast

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Message-ID: <33587c80-d273-acf3-2d95-65d757b188df@linaro.org>
Date:   Mon, 26 Oct 2020 19:35:18 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Bernard <bernard@...o.com>, Zhang Rui <rui.zhang@...el.com>,
        Amit Kucheria <amitk@...nel.org>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     opensource.kernel@...o.com
Subject: Re: [Resend][PATCH] drivers/thermal: optimize the for circle to run a
 bit fast

On 26/10/2020 02:49, Bernard wrote:
> Function thermal_zone_device_register, in the for circle, if the
> first if branch set the count bit in tz->trips_disabled, there is
> no need to set in the other if branch again.
> This change is to make the code run a bit fast and readable.
> 
> Signed-off-by: Bernard Zhao <bernard@...o.com>
> ---
>  drivers/thermal/thermal_core.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
> index c6d74bc1c90b..03577794eea3 100644
> --- a/drivers/thermal/thermal_core.c
> +++ b/drivers/thermal/thermal_core.c
> @@ -1446,10 +1446,14 @@ thermal_zone_device_register(const char *type, int trips, int mask,
>  		goto release_device;
>  
>  	for (count = 0; count < trips; count++) {
> -		if (tz->ops->get_trip_type(tz, count, &trip_type))
> +		if (tz->ops->get_trip_type(tz, count, &trip_type)) {
>  			set_bit(count, &tz->trips_disabled);
> -		if (tz->ops->get_trip_temp(tz, count, &trip_temp))
> +			continue;
> +		}
> +		if (tz->ops->get_trip_temp(tz, count, &trip_temp)) {
>  			set_bit(count, &tz->trips_disabled);
> +			continue;
> +		}
>  		/* Check for bogus trip points */
>  		if (trip_temp == 0)
>  			set_bit(count, &tz->trips_disabled);


What about ?

	if (tz->ops->get_trip_type(tz, count, &trip_type) ||
		tz->ops->get_trip_temp(tz, count, &trip_temp) ||
		!trip_temp)
		set_bit(count, &tz->trips_disabled);




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