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From: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
To: shuah <shuah@kernel.org>
Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>,
	Brendan Higgins <brendanhiggins@google.com>,
	Joe Perches <joe@perches.com>,
	kunit-dev@googlegroups.com, linux-kernel@vger.kernel.org,
	linux-kselftest@vger.kernel.org, frowand.list@gmail.com,
	sboyd@kernel.org, pmladek@suse.com, sergey.senozhatsky@gmail.com,
	rostedt@goodmis.org, Randy Dunlap <rdunlap@infradead.org>,
	Stephen Rothwell <sfr@canb.auug.org.au>
Subject: Re: [PATCH v2] kunit: fix failure to build without printk
Date: Fri, 30 Aug 2019 14:19:48 +0900
Message-ID: <20190830051941.GA3598@jagdpanzerIV> (raw)
In-Reply-To: <8b2d63bf-56cd-e8f5-e8ee-2891c2c1be8f@kernel.org>

On (08/29/19 11:01), shuah wrote:
[..]
> Hi Sergey,
> 
> What are the guidelines for using printk(). I recall some discussion
> about not using printk(). I am seeing the following from checkpatch
> script:

Hello,

> WARNING: Prefer [subsystem eg: netdev]_level([subsystem]dev, ... then
> dev_level(dev, ... then pr_level(...  to printk(KERN_LEVEL ...
> #105: FILE: include/kunit/test.h:343:
> +	printk(KERN_LEVEL "\t# %s: " fmt, (test)->name, ##__VA_ARGS__)
> 

Oh, right.
So we sort of want people to use pr_err()/pr_info()/pr_"level"()
because, otherwise, when people use plain printk(), they tend to
forget to add KERN_LEVEL.

In kunit case everything looks fine. KERN_LEVEL is there so I'm
fine with the patch.

You still can switch to pr_info()/pr_err()/pr_etc, just to make
checkpatch happier, but that's up to you.

> Is there supposed to be pr_level() - I can find dev_level()

No, not really. pr_level() stands for pr_"debug"()/pr_"info"()/etc.

E.g.

#define pr_emerg(fmt, ...) \
        printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
#define pr_alert(fmt, ...) \
        printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
#define pr_crit(fmt, ...) \
        printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
#define pr_err(fmt, ...) \
        printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
#define pr_warning(fmt, ...) \
        printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
#define pr_warn pr_warning
#define pr_notice(fmt, ...) \
        printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
#define pr_info(fmt, ...) \
        printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)

	-ss

  parent reply index

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-28  9:31 Brendan Higgins
2019-08-28  9:49 ` Sergey Senozhatsky
2019-08-28 11:50   ` Petr Mladek
2019-08-29 17:01   ` shuah
2019-08-30  4:44     ` Joe Perches
2019-08-30  4:56       ` Joe Perches
2019-08-30 18:38       ` Brendan Higgins
2019-08-30 20:46         ` Joe Perches
2019-08-30 21:58           ` Tim.Bird
2019-08-30 22:46             ` Joe Perches
2019-08-30 23:02               ` Brendan Higgins
2019-08-30 23:22                 ` Tim.Bird
2019-08-30 23:36                   ` Joe Perches
2019-08-30 23:37                   ` Brendan Higgins
2019-08-30 23:43                     ` Joe Perches
2019-08-31  0:06                     ` Tim.Bird
2019-09-02 12:52                     ` Petr Mladek
2019-09-02 14:39                       ` shuah
2019-08-30 23:29               ` Tim.Bird
2019-08-30  5:19     ` Sergey Senozhatsky [this message]
2019-08-28 15:52 ` Randy Dunlap

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