linux-kernel - Re: [PATCH v2] checkpatch: Suggest using min_t or max

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Date:	Wed, 05 Sep 2012 17:35:16 -0700
From:	Joe Perches <joe@...ches.com>
To:	Philippe De Muyter <philippe.demuyter@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Whitcroft <apw@...onical.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] checkpatch: Suggest using min_t or max_t

On Thu, 2012-09-06 at 02:16 +0200, Philippe De Muyter wrote:
> On Wed, Sep 5, 2012 at 7:07 PM, Joe Perches <joe@...ches.com> wrote:
> > On Wed, 2012-09-05 at 13:21 +0200, Philippe De Muyter wrote:
> >> > v2: Make $match_balanced_parentheses work in perl 5.8
> >>
> >> Has this been applied  ?
> >>
> >> v3.3 version of checkpatch.pl works for me, but v3.4, v3.5 & v3.6rc2 say:
> >> Nested quantifiers in regex; marked by <-- HERE in m/(\((?:[^\(\)]++
> >> <-- HERE |(?-1))*\))/ at scripts/checkpatch.pl line 340.
> >>
> >> and my perl is :
> >>
> >>         perl --version
> >>
> >>         This is perl, v5.8.8 built for i586-linux-thread-multi
> >
> > The current version of checkpatch skips this
> > check when the perl version is less than 5.10.0
> >
> >
> > commit d7c76ba7e58bc3ca674f20759c686535db484749
> > Author: Joe Perches <joe@...ches.com>
> > Date:   Tue Jan 10 15:09:58 2012 -0800
> >
> >     checkpatch: improve memset and min/max with cast checking
> >
> >     Improve the checking of arguments to memset and min/max tests.
> >
> >     Move the checking of min/max to statement blocks instead of single line.
> >     Change $Constant to allow any case type 0x initiator and trailing ul
> >     specifier.  Add $FuncArg type as any function argument with or without a
> >     cast.  Print the whole statement when showing memset or min/max messages.
> >     Improve the memset with 0 as 3rd argument error message.
> >
> >     There are still weaknesses in the $FuncArg and $Constant code as arbitrary
> >     parentheses and negative signs are not generically supported.
> >
> > []
> > # Using $balanced_parens, $LvalOrFunc, or $FuncArg
> > # requires at least perl version v5.10.0
> > # Any use must be runtime checked with $^V
> > []
> > # typecasts on min/max could be min_t/max_t
> >                 if ($^V && $^V ge 5.10.0 &&
> >                     defined $stat &&
> >                     $stat =~ /^\+(?:.*?)\b(min|max)\s*\(\s*$FuncArg\s*,\s*$FuncArg\s*\)/) {
> >
> >
> 
> I know nothing about perl, and when I read 3.6rc2's checkpatch.pl it
> seems to me that every usage of  $balanced_parens, $LvalOrFunc, or
> $FuncArg is protected by a test for v5.10.0, but line 340, which perl
> complains about, is not a use, but merely a definition.  Should the
> definition not be protected too ?

Beats me.

I'm not a perl monk either.  Maybe it should.
I don't have 5.8 and the latest is 5.16.
5.8 is pretty old.

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