linux-kernel - Re: [PATCH 1/1] staging: comedi: use __func_

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Date:   Sat, 29 Apr 2017 10:21:33 -0700
From:   Joe Perches <joe@...ches.com>
To:     Dhiru Kholia <dhiru.kholia@...il.com>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     Ian Abbott <abbotti@....co.uk>,
        H Hartley Sweeten <hsweeten@...ionengravers.com>
Subject: Re: [PATCH 1/1] staging: comedi: use __func__ instead of hardcoded
 function name

On Sat, 2017-04-29 at 22:17 +0530, Dhiru Kholia wrote:
> This coding style issue was found by checkpatch.pl script. Using
> __func__ instead of hardcoded function name should help in future
> refactoring of this code.
> 
> Signed-off-by: Dhiru Kholia <dhiru.kholia@...il.com>
> ---
>  drivers/staging/comedi/drivers/quatech_daqp_cs.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/comedi/drivers/quatech_daqp_cs.c b/drivers/staging/comedi/drivers/quatech_daqp_cs.c
> index 802f51e..ea194aa 100644
> --- a/drivers/staging/comedi/drivers/quatech_daqp_cs.c
> +++ b/drivers/staging/comedi/drivers/quatech_daqp_cs.c
> @@ -248,7 +248,7 @@ static irqreturn_t daqp_interrupt(int irq, void *dev_id)
>  
>  	if (loop_limit <= 0) {
>  		dev_warn(dev->class_dev,
> -			 "loop_limit reached in daqp_interrupt()\n");
> +			 "loop_limit reached in %s()\n", __func__);

More common would be:
		dev_warn(dev->class_dev, "%s: loop limit reached\n", __func__);

It also seems that the loop_limit test, a loop count,
is sensitive on the cpu frequency and perhaps should
be some timer based limit instead.