linux-kernel - Re: [PATCH] Update min() to min

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Date:   Tue, 21 Sep 2021 21:11:25 +0200
From:   Philipp Hortmann <philipp.g.hortmann@...il.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Update min() to min_t()

On 9/21/21 8:04 AM, Greg KH wrote:
> On Tue, Sep 21, 2021 at 07:52:46AM +0200, Philipp Hortmann wrote:
>> diff --git a/drivers/usb/usb-skeleton.c b/drivers/usb/usb-skeleton.c
>> index 2dc58766273a..d87deee3e26e 100644
>> --- a/drivers/usb/usb-skeleton.c
>> +++ b/drivers/usb/usb-skeleton.c
>> @@ -363,7 +363,7 @@ static ssize_t skel_write(struct file *file, const char *user_buffer,
>>   	int retval = 0;
>>   	struct urb *urb = NULL;
>>   	char *buf = NULL;
>> -	size_t writesize = min(count, (size_t)MAX_TRANSFER);
>> +	size_t writesize = min_t(size_t, count, MAX_TRANSFER);
>>   
>>   	dev = file->private_data;
>>   
>> -- 
>> 2.25.1
>>
> 
> Has anyone actually built this driver in a while?
> 
> thanks,
> 
> greg k-h
> 
Hi,

I have build and loaded the driver. To me this seems OK.

dmesg from loading:
usb_skeleton: loading out-of-tree module taints kernel.
usb_skeleton: module verification failed: signature and/or required key 
missing - tainting kernel
usbcore: registered new interface driver skeleton

dmesg from unloading:
usbcore: deregistering interface driver skeleton

Used kernel 5.15.0-rc1+

Bye Philipp