tree bf2a8845a031cb685219db2ddcb3d296b4a9ffab
parent 7d2a175b9bf6e9422bebe95130a3c79a25ff4602
author Nick Piggin <npiggin@suse.de> 1217395393 +1000
committer Benjamin Herrenschmidt <benh@kernel.crashing.org> 1217395614 +1000

powerpc/mm: Lockless get_user_pages_fast() for 64-bit (v3)

Implement lockless get_user_pages_fast for 64-bit powerpc.

Page table existence is guaranteed with RCU, and speculative page references
are used to take a reference to the pages without having a prior existence
guarantee on them.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>