linux-kernel - Re: [PATCH 2/2] hfsplus: add printk to log allocation failure in hfs_find

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Message-ID: <1365401315.2673.11.camel@slavad-ubuntu>
Date:	Mon, 08 Apr 2013 10:08:35 +0400
From:	Vyacheslav Dubeyko <slava@...eyko.com>
To:	Joe Perches <joe@...ches.com>
Cc:	Alexey Khoroshilov <khoroshilov@...ras.ru>,
	Hin-Tak Leung <htl10@...rs.sourceforge.net>,
	Al Viro <viro@...iv.linux.org.uk>,
	Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>,
	Christoph Hellwig <hch@....de>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, ldv-project@...uxtesting.org
Subject: Re: [PATCH 2/2] hfsplus: add printk to log allocation failure in
 hfs_find_init()

On Sun, 2013-04-07 at 15:00 -0700, Joe Perches wrote:
> On Mon, 2013-04-08 at 01:21 +0400, Alexey Khoroshilov wrote:
> > Add printk to log allocation failure in hfs_find_init(),
> > "so that there is a sign in dmesg when the error condition is triggered".
> > (per Hin-Tak Leung request)
> 
> Not needed.  There already is a generic dump_stack
> on all allocation failures without __GFP_NOWARN.
> 

I agree too.

Moreover, Hin-Tak asks about dprint() but not printk(). The dprint()
messages can be useful for debugging purposes and will be disabled for
usual kernel build.

I think that adding dprint() messages in hfs_find_init() is not
necessary. But adding dprint() for __hfsplus_ext_write_extent() and
other places can be useful, from my point of view. And such messages can
be useful as for HFS+ as for HFS drivers.

With the best regards,
Vyacheslav Dubeyko.

> > diff --git a/fs/hfsplus/bfind.c b/fs/hfsplus/bfind.c
> []
> > @@ -18,8 +18,10 @@ int hfs_find_init(struct hfs_btree *tree, struct hfs_find_data *fd)
> 
> > +	if (!ptr) {
> > +		printk(KERN_ERR "hfs: allocation failed in hfs_find_init()\n");
> >  		return -ENOMEM;
> 
> 
> --
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