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powerpc/8xx: Always pin kernel instruction TLB
authorJoakim Tjernlund <joakim.tjernlund@transmode.se>
Tue, 29 Dec 2009 05:10:58 +0000 (05:10 +0000)
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>
Fri, 15 Jan 2010 02:20:07 +0000 (13:20 +1100)
Various kernel asm modifies SRR0/SRR1 just before executing
a rfi. If such code crosses a page boundary you risk a TLB miss
which will clobber SRR0/SRR1. Avoid this by always pinning
kernel instruction TLB space.

Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

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