linux-kernel - Re: [PATCH] connector: Delete an error message for a failed memory allocation in cn_queue_alloc_callback

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Message-ID: <20170828060545.yddjpqzitw46lgiu@mwanda>
Date:   Mon, 28 Aug 2017 09:05:45 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     "Waskiewicz Jr, Peter" <peter.waskiewicz.jr@...el.com>
Cc:     SF Markus Elfring <elfring@...rs.sourceforge.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Evgeniy Polyakov <zbr@...emap.net>,
        LKML <linux-kernel@...r.kernel.org>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>
Subject: Re: [PATCH] connector: Delete an error message for a failed memory
 allocation in cn_queue_alloc_callback_entry()

On Sun, Aug 27, 2017 at 11:16:06PM +0000, Waskiewicz Jr, Peter wrote:
> On 8/27/17 3:26 PM, SF Markus Elfring wrote:
> > From: Markus Elfring <elfring@...rs.sourceforge.net>
> > Date: Sun, 27 Aug 2017 21:18:37 +0200
> > 
> > Omit an extra message for a memory allocation failure in this function.
> > 
> > This issue was detected by using the Coccinelle software.
> 
> Did coccinelle trip on the message or the fact you weren't returning NULL?
> 

You've misread the patch somehow.  The existing code has a NULL return
and it's preserved in Markus's patch.  This sort of patch is to fix a
checkpatch.pl warning.  The error message from this kzalloc() isn't going
to get printed because it's a small allocation and small allocations
always succeed in current kernels.  But probably the main reason
checkpatch complains is that kmalloc() already prints a stack trace and
a bunch of other information so the printk doesn't add anyting.
Removing it saves a little memory.

I'm mostly a fan of running checkpatch on new patches or staging and not
on old code...

regards,
dan carpenter