linux-kernel - Re: [PATCH 1/3] rbtree_test: use pr_info for module prefix in messages

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Message-ID: <1363652979.1932.23.camel@joe-AO722>
Date:	Mon, 18 Mar 2013 17:29:39 -0700
From:	Joe Perches <joe@...ches.com>
To:	Davidlohr Bueso <davidlohr.bueso@...com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Michel Lespinasse <walken@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] rbtree_test: use pr_info for module prefix in
 messages

On Mon, 2013-03-18 at 16:47 -0700, Davidlohr Bueso wrote:
> On Mon, 2013-03-18 at 16:44 -0700, Joe Perches wrote:
> > On Mon, 2013-03-18 at 16:20 -0700, Davidlohr Bueso wrote:
> > > This provides nicer message output. Since it seems more appropriate
> > > for the nature of this module, also use KERN_INFO instead of other
> > > levels.
> > []
> > > diff --git a/lib/rbtree_test.c b/lib/rbtree_test.c
> > []
> > > @@ -153,7 +156,7 @@ static int rbtree_test_init(void)
> > >  	int i, j;
> > >  	cycles_t time1, time2, time;
> > >  
> > > -	printk(KERN_ALERT "rbtree testing");
> > > +	pr_info("rbtree testing");
> > >  
> > >  	prandom_seed_state(&rnd, 3141592653589793238ULL);
> > >  	init();
> > > @@ -171,7 +174,7 @@ static int rbtree_test_init(void)
> > >  	time = time2 - time1;
> > >  
> > >  	time = div_u64(time, PERF_LOOPS);
> > > -	printk(" -> %llu cycles\n", (unsigned long long)time);
> > > +	pr_info(" -> %llu cycles\n", (unsigned long long)time);
> > 
> > You change the output here by more than just adding a prefix.
> > 
> > The first printk didn't have a newline.
> > 
> > The old code would print:
> > 
> > "rbtree testing -> <foo> cycles"
> > 
> > The new code prints:
> > 
> > "rbtree_test: rbtree testing"
> > "rbtree_test: -> <foo> cycles"
> > 
> 
> Ah, I see. This is actually the first time I'm using pr_* calls. I
> actually don't mind the new format, it looked
> ok, but if others don't agree, I can always resend it.

Your choice.  I don't prefer one over the other.

I do prefer you add an explicit newline to the first
format though instead of relying on the implicit
newline the printk subsystem will emit during the next
pr_<level> call.

cheers, Joe

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