slab: document SLAB_DESTROY_BY_RCU
Explain this SLAB_DESTROY_BY_RCU thing... [hugh@veritas.com: add a pointer to comment in mm/slab.c] Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: NJens Axboe <jens.axboe@oracle.com> Acked-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: NChristoph Lameter <cl@linux-foundation.org> Signed-off-by: NHugh Dickins <hugh@veritas.com> Signed-off-by: NPekka Enberg <penberg@cs.helsinki.fi>
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