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From: Arnd Bergmann <arnd@arndb.de>
To: Alexey Dobriyan <adobriyan@gmail.com>
Subject: Re: [PATCH] Add a personality to report 2.6.x version numbers
Date: Wed, 24 Aug 2011 19:02:46 +0200
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Cc: Colin Walters <walters@verbum.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Andi Kleen <andi@firstfloor.org>, akpm@linux-foundation.org,
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On Wednesday 24 August 2011, Alexey Dobriyan wrote:
> Was this fixed? Yes.
> Will this break one more time? Of course!
> 
>          case "${kernel}" in
> -             2.6.*)
> +             2.6.*|3.*)
>                     AC_MSG_RESULT([2.6 family (${kernel})])

What you need is an exaustive list of past versions plus
a catch-all for future versions:

	case "${kernel}" in
		1.*|2.0.*|2.1.*|2.2.*|2.3.*)
			echo "too old"
			;;
		2.4.*)
			echo "Linux-2.4 style"
			;;
		2.5.*)
			echo "unstable and not supported"
			;;
		*)
			echo "2.6 or newer"
			;;
	esac

We don't break ABIs as a rule, so you should always assume
that a newer version will keep working.

	Arnd