linux-kernel - Re: [PATCH] checkpatch.pl: Add warning for new _

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Date:	Mon, 24 Feb 2014 13:28:24 -0800
From:	Joe Perches <joe@...ches.com>
To:	Tom Rini <trini@...com>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Josh Triplett <josh@...htriplett.org>
Subject: Re: [PATCH] checkpatch.pl: Add warning for new __packed additions

On Mon, 2014-02-24 at 16:11 -0500, Tom Rini wrote:
> On 02/24/2014 04:00 PM, Joe Perches wrote:
> > On Mon, 2014-02-24 at 15:38 -0500, Tom Rini wrote:
> >> While there are valid reasons to use __packed, often the answer is that
> >> you should be doing something else here instead.
[]
> > How often is this actually a problem?
> 
> I think the first line answers the second one, honestly.  If one wants
> to get pedantic about things and really investigate there's probably
> some unneeded usages scattered about, and that's generally the type of
> thing one wants to address when checking whole files, right?

Maybe not.

That entirely depends on the correct and necessary uses of
packed vs the incorrect usage rates.

I think almost all packed uses are correct and there might
be a lot of patches submitted to remove them by over-zealous
advocates of checkpatch -f.

> > This may be better as
> > 	"Using 'packed' can impact performance\n"
> > and only tested when not in --file mode.
> 
> I can also make this change, sure, just point me off-list for an example
> to crib from and test?

Look at the FSF mailing address test as an example:

			my $msg_type = \&ERROR;
			$msg_type = \&CHK if ($file);
			&{$msg_type}("FSF_MAILING_ADDRESS",



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