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powerpc: Fix fatal SLB miss when restoring PPR
authorBenjamin Herrenschmidt <benh@kernel.crashing.org>
Tue, 5 Nov 2013 05:33:22 +0000 (16:33 +1100)
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>
Wed, 6 Nov 2013 03:13:53 +0000 (14:13 +1100)
commit0c4888ef1d8a8b82c29075ce7e257ff795af15c7
tree22f37dca43e49a79236b1279511778a1e8d12c61tree | snapshot (tar.gz zip)
parent36954dc78d8a1dcd4780cf4bd0fc6292791821b9commit | diff
powerpc: Fix fatal SLB miss when restoring PPR

When restoring the PPR value, we incorrectly access the thread structure
at a time where MSR:RI is clear, which means we cannot recover from nested
faults. However the thread structure isn't covered by the "bolted" SLB
entries and thus accessing can fault.

This fixes it by splitting the code so that the PPR value is loaded into
a GPR before MSR:RI is cleared.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
arch/powerpc/include/asm/ppc_asm.h diff | blob | blame | history
arch/powerpc/kernel/entry_64.S diff | blob | blame | history