From: Kees Cook <keescook@chromium.org>
To: Matthew Wilcox <willy@infradead.org>
Cc: Joe Perches <joe@perches.com>,
LKML <linux-kernel@vger.kernel.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
Dwaipayan Ray <dwaipayanray1@gmail.com>,
LukasBulwahn <lukas.bulwahn@gmail.com>,
linux-doc@vger.kernel.org, devicetree@vger.kernel.org,
linux-kbuild@vger.kernel.org, linux-hardening@vger.kernel.org,
linux-riscv@lists.infradead.org, netdev@vger.kernel.org,
linux-csky@vger.kernel.org
Subject: Re: What is the oldest perl version being used with the kernel ? update oldest supported to 5.14 ?
Date: Fri, 20 Aug 2021 22:43:08 -0700 [thread overview]
Message-ID: <202108201856.41AB391@keescook> (raw)
In-Reply-To: <YR/zrjiCwnzMMcmA@casper.infradead.org>
On Fri, Aug 20, 2021 at 07:25:50PM +0100, Matthew Wilcox wrote:
> On Fri, Aug 20, 2021 at 10:27:59AM -0700, Joe Perches wrote:
> > Perl 5.8 is nearly 20 years old now.
> >
> > https://en.wikipedia.org/wiki/Perl_5_version_history
> >
> > checkpatch uses regexes that are incompatible with perl versions
> > earlier than 5.10, but these uses are currently runtime checked
> > and skipped if the perl version is too old. This runtime checking
> > skips several useful tests.
> >
> > There is also some desire for tools like kernel-doc, checkpatch and
> > get_maintainer to use a common library of regexes and functions:
> > https://lore.kernel.org/lkml/YR2lexDd9N0sWxIW@casper.infradead.org/
> >
> > It'd be useful to set the minimum perl version to something more modern.
> >
> > I believe perl 5.14, now only a decade old, is a reasonable target.
> >
> > Any objections or suggestions for a newer minimum version?
>
> Not an objection per se, but some data points.
>
> Oracle Linux 5 (released 2007, still under support) has perl 5.8.8
> Oracle Linux 6 (released 2011) has perl 5.10.1
> Oracle Linux 7 (released 2014) has perl 5.16.3
> Oracle Linux 8 (released 2019) has perl 5.26.3
>
> I don't know that we need to be able to build on a distro from 2007
> or even from 2011. I think it's reasonable to require updating to a
> 2014 distro in order to build a 2021 kernel.
>
> For comparison, we currently require gcc-4.9 to build the kernel, and
> 4.9.0 was released in 2014. So perl-5.16 wouldn't be an unreasonable
> requirement, I believe.
Ubuntu name/version mapping: https://wiki.ubuntu.com/
Ubuntu Perl versions: https://launchpad.net/ubuntu/+source/perl
The oldest publicly supported Ubuntu (18.04 Bionic) uses Perl 5.26.
--
Kees Cook
prev parent reply other threads:[~2021-08-21 5:43 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-20 17:27 What is the oldest perl version being used with the kernel ? update oldest supported to 5.14 ? Joe Perches
2021-08-20 17:33 ` Willy Tarreau
2021-08-20 18:25 ` Matthew Wilcox
2021-08-21 5:43 ` Kees Cook [this message]
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