[asterisk-dev] Proposal for DAHDI-trunk: deprecate old kernels
oron.peled at xorcom.com
Thu Dec 29 11:42:39 CST 2011
Currently there's no policy for deprecating support for old kernels
in DAHDI-linux, so we have all kinds of code monstrosities to
support anything from prehistoric kernels (2.6.8/9) to the latest
I'd like to propose a general policy and then derive a specific
case for the near future.
1. General kernel deprecation policy:
* Stable DAHDI branches (no change from current practices):
- Newer kernels are supported as long as the branch is
supported. Obviously, after that it's in deep freeze.
- No deprecation of old kernels. What worked before,
would continue to work even if it is used on a very
old "Enterprise" distro.
* Trunk - Latest kernels are always supported
* Trunk - Old kernels:
- A deprecation means output a NOTICE(), but still have
the code to support the old kernel
- Support removal happens when we decide to remove the
old code that support building DAHDI-linux on old kernels.
- Fast paced distros should be always supported by trunk
(Fedora, Debian-testing, Ubuntu, OpenSuse, name your favorite).
These distributions have a kernel life-cycle that is short
and therefore does not impose maintenance problems for DAHDI-linux.
- Kernels for current Stable/"Enterprise" distros would be fully
- Kernels for previous Stable/"Enterprise" distros would be
deprecated (remember, only on trunk).
- After the next DAHDI-linux stable release, the support code
for the deprecated versions would be removed from our trunk.
[yes, those ugly #ifdefs]
2. Let's try to apply this to the near future. As mentioned
before, we can safely ignore fast paced distros and focus
only on Stable/"Enterprise"/LTS distros.
- Current version: RHEL-6.x (kernel 2.6.32)
- Deprecated version: RHEL-5.x (kernel 2.6.18)
- Older version: RHEL-4.x (kernel 2.6.9)
[End of Regular Life Cycle - 29-Feb-2012]
* Suse SLES:
- Current version: SLES-11 (kernel 2.6.32)
- Deprecated version: SLES-10 (kernel 2.6.16)
[End of General Support - 12-Apr-2011]
- Current version: Debian-6.0.x "Squeeze" (kernel 2.6.26)
- Deprecated version: Debian-5.0.x "Lenny" (kernel 2.6.32)
[End Of Life - 2-Feb-2012]
- Current LTS version: 10.04 "Lucid Lynx" (kernel 2.6.32)
- Deprecated version: 8.04 "Hardy Heron" (kernel 2.6.24)
[End Of Life (server) - Apr-2013]
3. Proposed timeline:
* After DAHDI-2.6/2.5 release:
Mark 2.6.8/2.6.9 kernel workarounds as deprecated in
our trunk. They are only used by RHEL/Centos-4 and
Debian-Etch (before oldstable=="lenny")
Can drop RHEL-4 support from trunk. At that time the oldest
kernel to support would be 2.6.18 (RHEL-5.x)
[good bye 2.6.8/2.6.9 quirks]
* After DAHDI-2.7:
Can mark 2.6.18 workarounds as deprecated (in our trunk).
At that time the oldest (non-deprecated) kernels to support
would be 2.6.24 (Ubuntu-8.04).
* After DAHDI-2.8:
Drop support for 2.6.18 kernels.
4. Now who did I forget to take in account? Let the flames begin ;-)
Oron Peled Voice: +972-4-8228492
oron at actcom.co.il http://users.actcom.co.il/~oron
Problems cannot be solved at the same level of awareness that
-- A. Einstein
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