| Date | Thu, 08 Apr 2010 16:31:43 -0400 | From | Rik van Riel <> | Subject | Re: [PATCH 01/13] powerpc: Add rcu_read_lock() to gup_fast() implementation |
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On 04/08/2010 03:17 PM, Peter Zijlstra wrote: > The powerpc page table freeing relies on the fact that IRQs hold off > an RCU grace period, this is currently true for all existing RCU > implementations but is not an assumption Paul wants to support. > > Therefore, also take the RCU read lock along with disabling IRQs to > ensure the RCU grace period does at least cover these lookups. > > Requested-by: Paul E. McKenney<paulmck@linux.vnet.ibm.com> > Signed-off-by: Peter Zijlstra<a.p.zijlstra@chello.nl> > Cc: Nick Piggin<npiggin@suse.de> > Cc: Benjamin Herrenschmidt<benh@kernel.crashing.org>
Reviewed-by: Rik van Riel <riel@redhat.com>
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