linux-kernel - Re: [PATCH] iio: imu: use min() to improve code

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Message-ID: <61dbf3f6-6b45-4823-a7ce-794c3ad5aca2@vivo.com>
Date: Sat, 16 Aug 2025 15:29:10 +0800
From: Qianfeng Rong <rongqianfeng@...o.com>
To: David Lechner <dlechner@...libre.com>,
 Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@....com>,
 Jonathan Cameron <jic23@...nel.org>, Nuno Sá
 <nuno.sa@...log.com>, Andy Shevchenko <andy@...nel.org>,
 linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iio: imu: use min() to improve code


在 2025/8/15 22:25, David Lechner 写道:
> On 8/15/25 3:06 AM, Qianfeng Rong wrote:
>> Use min() to reduce code in inv_icm42600_buffer_update_fifo_period()
>> and inv_icm42600_buffer_update_watermark(), and improve readability.
>>
>> Signed-off-by: Qianfeng Rong <rongqianfeng@...o.com>
>> ---
>>   drivers/iio/imu/inv_icm42600/inv_icm42600_buffer.c | 11 +++--------
>>   1 file changed, 3 insertions(+), 8 deletions(-)
>>
>> diff --git a/drivers/iio/imu/inv_icm42600/inv_icm42600_buffer.c b/drivers/iio/imu/inv_icm42600/inv_icm42600_buffer.c
>> index 7c4ed981db04..91d166de1231 100644
>> --- a/drivers/iio/imu/inv_icm42600/inv_icm42600_buffer.c
>> +++ b/drivers/iio/imu/inv_icm42600/inv_icm42600_buffer.c
>> @@ -9,6 +9,7 @@
>>   #include <linux/pm_runtime.h>
>>   #include <linux/regmap.h>
>>   #include <linux/delay.h>
>> +#include <linux/minmax.h>
> Would be nice to put this in alphabetical order the best we can.
Thanks! Good to know this detail.
>
>>   
>>   #include <linux/iio/buffer.h>
>>   #include <linux/iio/common/inv_sensors_timestamp.h>
>> @@ -112,10 +113,7 @@ void inv_icm42600_buffer_update_fifo_period(struct inv_icm42600_state *st)
>>   	else
>>   		period_accel = U32_MAX;
>>   
>> -	if (period_gyro <= period_accel)
>> -		period = period_gyro;
>> -	else
>> -		period = period_accel;
>> +	period = min(period_gyro, period_accel);
>>   
>>   	st->fifo.period = period;
> Might as well just drop the local variable in this one and save
> another line (and a blank line).
It is indeed better to drop the local variable.
>
>>   }
>> @@ -238,10 +236,7 @@ int inv_icm42600_buffer_update_watermark(struct inv_icm42600_state *st)
>>   		else
>>   			latency = latency_accel - (latency_gyro % latency_accel);
>>   		/* use the shortest period */
> We could remove the comment as well since it should be
> obvious from the code.
ok :)
>
>> -		if (period_gyro <= period_accel)
>> -			period = period_gyro;
>> -		else
>> -			period = period_accel;
>> +		period = min(period_gyro, period_accel);
>>   		/* all this works because periods are multiple of each others */
>>   		watermark = latency / period;
> Could probably also drop the local variable here and still fit everything on one line.
I will try to do this in the next version.
>
>>   		if (watermark < 1)
Best regards,
Qianfeng