linux-kernel - Re: [PATCH v2 1/3] mtd: mtdoops: change printk() to counterpart pr

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Date:   Fri, 07 Oct 2022 00:09:26 -0700
From:   Joe Perches <joe@...ches.com>
To:     Ray Zhang <sgzhang@...gle.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>
Cc:     linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] mtd: mtdoops: change printk() to counterpart pr_
 functions

On Fri, 2022-10-07 at 06:50 +0000, Ray Zhang wrote:
> To comply with latest kernel code requirement, change printk() to
> counterpart pr_ functions in mtdoops driver:
> - change printk(INFO) to pr_info()
> - change printk(DEBUG) to pr_debug()

There is a different behavior with printk(KERN_DEBUG to pr_debug(
as pr_debug is a no-op unless dynamic debugging is enabled or
DEBUG is defined.

And even with dynamic_debug, the output is default disabled unless
DEBUG is defined.

As is, printk(KERN_DEBUG is emitted unless the console level is low.

> diff --git a/drivers/mtd/mtdoops.c b/drivers/mtd/mtdoops.c
[]
> @@ -120,8 +120,8 @@ static void mtdoops_inc_counter(struct mtdoops_context *cxt)
>  		return;
>  	}
>  
> -	printk(KERN_DEBUG "mtdoops: ready %d, %d (no erase)\n",
> -	       cxt->nextpage, cxt->nextcount);
> +	pr_debug("mtdoops: ready %d, %d (no erase)\n",
> +		 cxt->nextpage, cxt->nextcount);
>  }

etc...