linux-kernel - Re: [PATCH 1/2] hfs/hfsplus: Convert dprint to hfs

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Date:	Sun, 14 Apr 2013 19:06:19 -0700
From:	Joe Perches <joe@...ches.com>
To:	htl10@...rs.sourceforge.net
Cc:	Vyacheslav Dubeyko <slava@...eyko.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] hfs/hfsplus: Convert dprint to hfs_dbg

On Mon, 2013-04-15 at 02:56 +0100, Hin-Tak Leung wrote:
> --- On Mon, 15/4/13, Joe Perches <joe@...ches.com> wrote:
> > On Mon, 2013-04-15 at 01:53 +0100,
> > Hin-Tak Leung wrote:
> > > --- On Mon, 8/4/13, Joe Perches <joe@...ches.com> wrote:
> > > > Use a more current logging style.
> > []
> > > I have been sitting on a patch which changes this part
> > of the code to dynamic debugging, and it is much simplier.
[]
> > This change wouldn't work well as it would make a mess
> > of output that uses no prefix (ie: emits at KERN_DEFAULT)
> > with output that uses KERN_DEBUG
> > 
> > That's the reason for _dbg and _dbg_cont.
> 
> Hmm, I don't get it. Is there any *existing* use of dprint
> in the hfplus code which is affected by your comment?

Code like this prints out currently on a single line at
KERN_DEFAULT.

@@ -138,16 +138,16 @@ void hfs_bnode_dump(struct hfs_bnode *node)
[]
        for (i = be16_to_cpu(desc.num_recs); i >= 0; off -= 2, i--) {
                key_off = hfs_bnode_read_u16(node, off);
-               dprint(DBG_BNODE_MOD, " %d", key_off);
+               hfs_dbg_cont(BNODE_MOD, " %d", key_off);

By converting this dprint() to pr_debug(), it would
print out on a multiple lines, one for each read.

That's why it should use a mechanism like dbg_cont.

btw: there is no current pr_debug_cont mechanism.


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