Re: [PATCH 4.4 4.9 v1 2/2] mm: slub: allocate_slab() enables IRQ right after scheduler starts

[Pavel Machek]

Hi!

> > An simple option would be to backport the series[3], which is possible
> > and has been verified[4]. However, that series pulls functional
> > changes like SYSTEM_SCHEDULING and adjustments for it,
> > early might_sleep() and smp_processor_id() supports, etc.
> > Therefore, this patch uses an extra (but not mainline) flag
> > "system_scheduling" provided by the prior patch instead of
> > introducing SYSTEM_SCHEDULING, then uses the same condition as
> > newer RT kernels in allocate_slab().
> 
> The proposal looks okay. However the verified upstream version not only
> addresses your issue but also makes smp_processor_id() and might_sleep()
> work in the early phase. I would prefer the upstream solution for those
> two reasons.

So... first, thanks for review. This is mostly my fault, Kazuhiro
Hayashi did full backport, but I asked for minimal version.

AFAICT there's no place for stable-rt to apply this, so we'll just be
taking this to our trees in CIP project. (And I prefer smaller
version. Additional checking is nice for development but not so nice
this late in development cycle).

Best regards,
								Pavel
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