Messages in this thread |  | | Subject | Re: [RFC][PATCH v3] slub: Keep page and object in sync in slab_alloc_node() | From | Eric Dumazet <> | Date | Fri, 18 Jan 2013 11:09:50 -0800 |
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On Fri, 2013-01-18 at 18:40 +0000, Christoph Lameter wrote:
> The fetching of the tid is the only critical thing here. If the tid is > retrieved from the right cpu then the cmpxchg will fail if any changes > occured to freelist or the page variable. > > The tid can be retrieved without disabling preemption through > this_cpu_read().
Strictly speaking, this_cpu_read() _does_ disable preemption.
Of course, on x86, this_cpu_read() uses __this_cpu_read()
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