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[SPARC64]: Do not allow mapping pages within 4GB of 64-bit VA hole.
authorDavid S. Miller <davem@sunset.davemloft.net>
Fri, 3 Mar 2006 02:12:27 +0000 (18:12 -0800)
committerDavid S. Miller <davem@sunset.davemloft.net>
Mon, 20 Mar 2006 09:14:14 +0000 (01:14 -0800)
The UltraSPARC T1 manual recommends this because the chip
could instruction prefetch into the VA hole, and this would
also make decoding  certain kinds of memory access traps
more difficult (because the chip sign extends certain pieces
of trap state).

Signed-off-by: David S. Miller <davem@davemloft.net>

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