linux-kernel - Re: [PATCH 3/3] checkpatch.pl: Add check for task comm references

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Message-ID: <op.vvlfaobx3l0zgt@mnazarewicz-glaptop>
Date:	Mon, 16 May 2011 23:29:02 +0200
From:	"Michal Nazarewicz" <mina86@...a86.com>
To:	LKML <linux-kernel@...r.kernel.org>,
	"John Stultz" <john.stultz@...aro.org>
Cc:	"Ted Ts'o" <tytso@....edu>, "Jiri Slaby" <jirislaby@...il.com>,
	"KOSAKI Motohiro" <kosaki.motohiro@...fujitsu.com>,
	"David Rientjes" <rientjes@...gle.com>,
	"Dave Hansen" <dave@...ux.vnet.ibm.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>, linux-mm@...ck.org
Subject: Re: [PATCH 3/3] checkpatch.pl: Add check for task comm references

On Mon, 16 May 2011 23:19:17 +0200, John Stultz wrote:
> Now that accessing current->comm needs to be protected,
> @@ -2868,6 +2868,10 @@ sub process {
>  			WARN("usage of NR_CPUS is often wrong - consider using  
> cpu_possible(), num_possible_cpus(), for_each_possible_cpu(), etc\n" .  
> $herecurr);
>  		}
> +# check for current->comm usage
> +		if ($line =~ /\b(?:current|task|tsk|t)\s*->\s*comm\b/) {

Not a checkpatch.pl expert but as far as I'm concerned, that looks  
reasonable.

I was sort of worried that t->comm could produce quite a few false  
positives
but all its appearances in the kernel (seem to) refer to task.

> +			WARN("comm access needs to be protected. Use get_task_comm, or  
> printk's \%ptc formatting.\n" . $herecurr);
> +		}
>  # check for %L{u,d,i} in strings
>  		my $string;
>  		while ($line =~ /(?:^|")([X\t]*)(?:"|$)/g) {


-- 
Best regards,                                         _     _
.o. | Liege of Serenely Enlightened Majesty of      o' \,=./ `o
..o | Computer Science,  Michal "mina86" Nazarewicz    (o o)
ooo +-----<email/xmpp: mnazarewicz@...gle.com>-----ooO--(_)--Ooo--
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