slub: tid must be retrieved from the percpu area of the current processor
As Steven Rostedt has pointer out: rescheduling could occur on a different processor after the determination of the per cpu pointer and before the tid is retrieved. This could result in allocation from the wrong node in slab_alloc(). The effect is much more severe in slab_free() where we could free to the freelist of the wrong page. The window for something like that occurring is pretty small but it is possible. Signed-off-by: NChristoph Lameter <cl@linux.com> Signed-off-by: NPekka Enberg <penberg@kernel.org>
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