Re: [PATCHv2] mm/slub: fix lockups on PREEMPT && !SMP kernels

[Christoph Lameter]

On Thu, 19 Mar 2015, Joonsoo Kim wrote:

> > I was under the impression that this_cpu operations would always result
> > in an access, much like the *_ONCE accessors, so we should aways redo
> > the access for this_cpu_read(s->cpu_slab->tid). Is that not the case?
>
> I'm not the expert on that operation. Christoph could answer it.

this_cpu_read() always generates a load via an asm instruction.
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