linux-kernel - Re: [PATCH V2] ARM: mvebu: at least report the kzalloc failure

Open Source and information security mailing list archives

Date:   Wed, 17 Apr 2019 14:07:44 +0200
From:   Gregory CLEMENT <gregory.clement@...tlin.com>
To:     Nicholas Mc Guire <der.herr@...r.at>, Andrew Lunn <andrew@...n.ch>
Cc:     Jason Cooper <jason@...edaemon.net>,
        Russell King <linux@...linux.org.uk>,
        linux-kernel@...r.kernel.org, Nicholas Mc Guire <hofrat@...dl.org>,
        linux-arm-kernel@...ts.infradead.org,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Subject: Re: [PATCH V2] ARM: mvebu: at least report the kzalloc failure

Hi Nicholas,

Nicholas Mc Guire <der.herr@...r.at> writes:

> On Tue, Apr 16, 2019 at 03:39:57PM +0200, Andrew Lunn wrote:
>> On Tue, Apr 16, 2019 at 05:56:31AM +0200, Nicholas Mc Guire wrote:
>> 
>> > Note that this will trigger a checkpatch WARNING
>> > "WARNING: Possible unnecessary 'out of memory' message"
>> > but comparing the oops with an without the one-line pr_err I would
>> > argue that it makes sense to include it:
>> 
>> Hi Nicholas
>> 
>> It might be worth adding this as a comment, so that newbies don't
>> submit patches removing the pr_err() because of the checkpatch
>> warning.
>>
> hmm... I think if we start doing that we would make quite a mess of
> documentation in the kernel. Also note its a warning stating "possible 
> unneceessary" - so I would not see the necessity.
>
> At most I would include a note on this in the commit message so that
> anyone checking the origin would see that this is intenttional - assuming
> that people modifying code would be using git blame to locate the
> origin of any code...

Don't bother to send a new version I don't attempt to take this
patch. As you pointed it is very unlikely that we get an error so early
during the boot for a very small amount of memory.

If it happened then we have serious trouble and the message provided by
the BUG() call will be more than enough.

Thanks,

Gregory

>
> thx!
> hofrat
>
> _______________________________________________
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> linux-arm-kernel@...ts.infradead.org
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-- 
Gregory Clement, Bootlin
Embedded Linux and Kernel engineering
http://bootlin.com

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