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SubjectRe: [RFC v13][PATCH 00/14] Kernel based checkpoint/restart
On Sun, 15 Feb 2009 00:08:02 +0100 Ingo Molnar <mingo@elte.hu> wrote:

>
> * Andrew Morton <akpm@linux-foundation.org> wrote:
>
> > Similar to the way in which perfectly correct and normal kernel
> > sometimes has to be changed because it unexpectedly upsets the -rt
> > patch.
>
> Actually, regarding -rt, we try to keep that in two buckets:
>
> 1) Normal kernel code works but is unclean or structured less
> than ideal. In this case we restructure the mainline code,
> but that change stands on its own four legs, without any
> -rt considerations.
>
> 2) Normal kernel code that is clean - i.e. a change that only
> matters to -rt. In this case we dont touch the mainline code,
> nor do we bother mainline.
>
> Do you know any specific example that falls outside of those categories?
>

It happens fairly regularly. Problems with irqs-off regions, problems
with preempt_disable() regions (came up just yesterday with a patch from
Jeremy).

Plus some convert-to-sleeping-lock conversions over the years which
weren't obviously needed in mainline. Or which at least had -rt
motivations. But that's different.







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