tree 010bad7b7e3d3969f6050406b448fbcbc57cdca0
parent 4d7868e6475d478172581828021bd8a356726679
author Christoph Lameter <cl@linux.com> 1358977548 +0000
committer Pekka Enberg <penberg@kernel.org> 1365160986 +0300

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: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>