Keep the FC6 kernel at 2.6.20 or move it to 2.6.21?

[dragoran]

Dave Jones wrote:
> On Sun, Apr 29, 2007 at 06:36:32PM +0200, dragoran wrote:
>  > 2.6.21.1 is out ... so whats the plan now? Relase a FC6 
>  > update(updates-testing) or stick with 2.6.20.x until 2.6.22 is 
>  > out/2.6.21 get some more testing?
>
> We could do a rebase to .21 this week, and push that out to testing,
> and if anything critical turns up before that becomes deemed stable,
> we could push a branched build off of .20 directly to updates.
>
>   
ok
> Most of the scary stuff (new libata pata drivers etc), we'd keep off,
> so things shouldn't be too bad.  The timer changes for tickless are
> probably the only remaining scary thing. For that we have a few choices.
> - Leave NO_HZ off.
>   Feature parity with FC6, though the code has still changed, and
>   may still find regressions. Probably the safest option.
> - Turn NO_HZ on.
>   Early preview of F7 features, saves power yadayada, may find new
>   bugs. (Gets us that nice fuzzy 'f6 bugs are f7 bugs' bonus though)
>   
what kind of bugs would this trigger? crashes? or "only" some weird 
timer/clock issues?
if this is done does this also mean that we can backport x86_64 tickless 
for F7 when its ready?