Re: [PATCH v2 2/4] scripts/kernel-doc: Replacing highlights hash by an array

From: Danilo Cesar Lemes de Paula <danilo.cesar@collabora.co.uk>
To: Mauro Carvalho Chehab <mchehab@osg.samsung.com>,
	Jonathan Corbet <corbet@lwn.net>
Cc: LMML <linux-media@vger.kernel.org>,
	linux-doc@vger.kernel.org, Randy Dunlap <rdunlap@infradead.org>,
	Daniel Vetter <daniel.vetter@ffwll.ch>,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	Herbert Xu <herbert@gondor.apana.org.au>,
	Stephan Mueller <smueller@chronox.de>,
	Michal Marek <mmarek@suse.cz>,
	linux-kernel@vger.kernel.org,
	intel-gfx <intel-gfx@lists.freedesktop.org>,
	dri-devel <dri-devel@lists.freedesktop.org>
Subject: Re: [PATCH v2 2/4] scripts/kernel-doc: Replacing highlights hash by an array
Date: Tue, 17 Nov 2015 13:48:06 -0200	[thread overview]
Message-ID: <564B4C36.2000004@collabora.co.uk> (raw)
In-Reply-To: <20151117132949.2c70d92f@recife.lan>

On 17-11-2015 13:29, Mauro Carvalho Chehab wrote:
> Em Tue, 17 Nov 2015 07:44:31 -0700
> Jonathan Corbet <corbet@lwn.net> escreveu:
> 
>> On Tue, 17 Nov 2015 08:40:46 -0200
>> Mauro Carvalho Chehab <mchehab@osg.samsung.com> wrote:
>>
>>> The above causes some versions of perl to fail, as keys expect a
>>> hash argument:
>>>
>>> Execution of .//scripts/kernel-doc aborted due to compilation errors.
>>> Type of arg 1 to keys must be hash (not private array) at .//scripts/kernel-doc line 2714, near "@highlights) "
>>>
>>> This is happening at linuxtv.org server, with runs perl version 5.10.1.
>>
>> OK, that's not good.  But I'm not quite sure what to do about it.
>>
>> Perl 5.10.1 is a little over six years old.  Nobody else has complained
>> (yet) about this problem.  So it might be best to "fix" this with a
>> minimum version added to the Changes file.
>>
>> Or maybe we need to revert the patch.
>>
>> So I'm far from a Perl expert, so I have no clue what the minimum version
>> would be if we were to say "5.10.1 is too old."  I don't suppose anybody
>> out there knows?
> 
> I'm also not a Perl expert, and never saw before the usage of "keys" on
> an array. Yet, according with:
> 	http://perldoc.perl.org/functions/keys.html
> 
> "in Perl 5.12 or later only, the indices of an array"
> 
> If so, then maybe we could replace:
> 	foreach my $k (keys @highlights)
> 
> by a more C style variant, with all versions of perl 5:
> 	for (my $k = 0; $k < @highlights; $k++) {
> 
> The enclosed patch should do the trick. I tested it with perl 5.10 and 
> perl 5.22 it worked fine with both versions.

I'm Not a perl guru myself either =/.

But thanks for fixing it Mauro!

Danilo