Re: WARNING: __GFP_FS allocations with IRQs disabled(kmemcheck_alloc_shadow)

[Christoph Lameter]

On Mon, 9 Jul 2012, JoonSoo Kim wrote:

> 2012/7/8 Fengguang Wu <fengguang.wu@xxxxxxxxx>:
> > Hi Vegard,
> >
> > This warning code is triggered for the attached config:
> >
> > __lockdep_trace_alloc():
> >         /*
> >          * Oi! Can't be having __GFP_FS allocations with IRQs disabled.
> >          */
> >         if (DEBUG_LOCKS_WARN_ON(irqs_disabled_flags(flags)))
> >                 return;
> >
> > Where the irq is possibly disabled at the beginning of __slab_alloc():
> >
> >         local_irq_save(flags);
>
> Currently, in slub code, kmemcheck_alloc_shadow is always invoked with
> irq_disabled.
> I think that something like below is needed.

Or you could move the kmem_check_enabled section to occur before the irq
is disabled.
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