powerpc/64s/hash: Use POWER6 SLBIA IH=1 variant in switch_slb

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The SLBIA IH=1 hint will remove all non-zero SLBEs, but only
invalidate ERAT entries associated with a class value of 1, for
processors that support the hint (e.g., POWER6 and newer), which
Linux assigns to user addresses.

This prevents kernel ERAT entries from being invalidated when
context switchig (if the thread faulted in more than 8 user SLBEs).

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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Nicholas Piggin 2018-09-15 01:30:49 +10:00 • committed by Michael Ellerman

parent 85376e2a17

commit 5141c182d7

1 changed files with 23 additions and 15 deletions

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38

arch/powerpc/mm/slb.c

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