]> git.baikalelectronics.ru Git - kernel.git/commit
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)
commit0f408944e7c9f1fb5b979d64eb38373093729f44
tree22f37dca43e49a79236b1279511778a1e8d12c61
parent6663fffb87b897c34fd8a3add9654eccfbec5bd3
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
arch/powerpc/kernel/entry_64.S