linux-kernel - Re: [PATCH 2/3] megaraid_sas: Convert printk to printk

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Date:	Tue, 27 Oct 2015 12:32:18 -0700
From:	Joe Perches <joe@...ches.com>
To:	Weidong Wang <wangweidong1@...wei.com>
Cc:	kashyap.desai@...gotech.com, sumit.saxena@...gotech.com,
	uday.lingala@...gotech.com, JBottomley@...n.com,
	megaraidlinux.pdl@...gotech.com, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] megaraid_sas: Convert printk to printk_<level>

On Tue, 2015-10-27 at 16:26 +0800, Weidong Wang wrote:
> Reduce object size a little by using pr_<level>
> calls instead of printk(KERN_<LEVEL>.

pr_debug does not behave the same as printk(KERN_DEBUG

pr_debug is only active when DEBUG is #defined or dynamic_debug
is enabled.

printk(KERN_DEBUG is always emitted as long as the debug level
is enabled for the console.

At a minimum, your commit message should show you know that.

> diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
[]
> @@ -5889,7 +5889,7 @@ static int megasas_mgmt_fasync(int fd, struct file *filep, int mode)
>  		return 0;
>  	}
>  
> -	printk(KERN_DEBUG "megasas: fasync_helper failed [%d]\n", rc);
> +	pr_debug("megasas: fasync_helper failed [%d]\n", rc);

[]

> @@ -6233,7 +6233,7 @@ static int megasas_mgmt_ioctl_aen(struct file *file, unsigned long arg)
>  	u32 wait_time = MEGASAS_RESET_WAIT_TIME;
>  
>  	if (file->private_data != file) {
> -		printk(KERN_DEBUG "megasas: fasync_helper was not "
> +		pr_debug("megasas: fasync_helper was not "
>  		       "called first\n");

Please also coalesce format strings where possible.


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