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authorMatt Evans <matt@ozlabs.org>2010-08-12 20:58:28 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2010-08-24 15:26:31 +1000
commitf761622e59433130bc33ad086ce219feee9eb961 (patch)
tree5368ebf02c7879d98d3158a2ff9ba3b612a5b471 /arch/powerpc/kernel/head_64.S
parent7aa241fdcef2a1d6587fe4c390e9fdbfc767af28 (diff)
powerpc: Initialise paca->kstack before early_setup_secondary
As early setup calls down to slb_initialize(), we must have kstack initialised before checking "should we add a bolted SLB entry for our kstack?" Failing to do so means stack access requires an SLB miss exception to refill an entry dynamically, if the stack isn't accessible via SLB(0) (kernel text & static data). It's not always allowable to take such a miss, and intermittent crashes will result. Primary CPUs don't have this issue; an SLB entry is not bolted for their stack anyway (as that lives within SLB(0)). This patch therefore only affects the init of secondaries. Signed-off-by: Matt Evans <matt@ozlabs.org> Cc: stable <stable@kernel.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel/head_64.S')
-rw-r--r--arch/powerpc/kernel/head_64.S6
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S
index 844a44b6447..4d6681dce81 100644
--- a/arch/powerpc/kernel/head_64.S
+++ b/arch/powerpc/kernel/head_64.S
@@ -572,9 +572,6 @@ __secondary_start:
/* Set thread priority to MEDIUM */
HMT_MEDIUM
- /* Do early setup for that CPU (stab, slb, hash table pointer) */
- bl .early_setup_secondary
-
/* Initialize the kernel stack. Just a repeat for iSeries. */
LOAD_REG_ADDR(r3, current_set)
sldi r28,r24,3 /* get current_set[cpu#] */
@@ -582,6 +579,9 @@ __secondary_start:
addi r1,r1,THREAD_SIZE-STACK_FRAME_OVERHEAD
std r1,PACAKSAVE(r13)
+ /* Do early setup for that CPU (stab, slb, hash table pointer) */
+ bl .early_setup_secondary
+
/* Clear backchain so we get nice backtraces */
li r7,0
mtlr r7