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Re: Distributions still suffering from s390 ABI change problems.

From: Siddhesh Poyarekar <siddhesh at redhat dot com>
To: Aurelien Jarno <aurelien at aurel32 dot net>
Cc: "Carlos O'Donell" <carlos at redhat dot com>, Jeff Law <law at redhat dot com>, David Miller <davem at davemloft dot net>, krebbel at linux dot vnet dot ibm dot com, roland at hack dot frob dot com, allan at archlinux dot org, libc-alpha at sourceware dot org
Date: Tue, 15 Jul 2014 15:53:34 +0530
Subject: Re: Distributions still suffering from s390 ABI change problems.
Authentication-results: sourceware.org; auth=none
References: <53C43A5E dot 9020304 at redhat dot com> <20140714 dot 132444 dot 140785163900092398 dot davem at davemloft dot net> <53C440FF dot 3010308 at redhat dot com> <20140714 dot 140948 dot 808129071568411651 dot davem at davemloft dot net> <53C449C0 dot 50709 at redhat dot com> <53C4C14E dot 30908 at redhat dot com> <20140715074223 dot GC32518 at hall dot aurel32 dot net> <20140715084921 dot GF17822 at spoyarek dot pnq dot redhat dot com> <20140715095838 dot GL1239 at hall dot aurel32 dot net>

On Tue, Jul 15, 2014 at 11:58:38AM +0200, Aurelien Jarno wrote:
> In addition understanding why this structure has to be extended instead
> of "needed for future hardware" might help to really understand the
> problem and look for alternative solutions.

A quick reading of the offending patch seems to indicate that it is
just a buffer extension in preparation for future hardware support,
i.e. all that the new code seems to do is to set the added field to 0,
in addition to adding some compat code for versioning.  Given that
we're not going to have the future hardware support in 2.20 (slushy
freeze and all), maybe we should push this to 2.21 and fix the ABI in
2.20.

Unless of course, it is evident that there is absolutely no way to
introduce the new hardware support that Andreas alluded to without
breaking ABI...

Siddhesh

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Follow-Ups:
- Re: Distributions still suffering from s390 ABI change problems.
  - From: Carlos O'Donell

References:
- Re: Distributions still suffering from s390 ABI change problems.
  - From: Carlos O'Donell
- Re: Distributions still suffering from s390 ABI change problems.
  - From: David Miller
- Re: Distributions still suffering from s390 ABI change problems.
  - From: Carlos O'Donell
- Re: Distributions still suffering from s390 ABI change problems.
  - From: David Miller
- Re: Distributions still suffering from s390 ABI change problems.
  - From: Jeff Law
- Re: Distributions still suffering from s390 ABI change problems.
  - From: Carlos O'Donell
- Re: Distributions still suffering from s390 ABI change problems.
  - From: Aurelien Jarno
- Re: Distributions still suffering from s390 ABI change problems.
  - From: Siddhesh Poyarekar
- Re: Distributions still suffering from s390 ABI change problems.
  - From: Aurelien Jarno

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