powerpc/book3e: initialize crit/mc/dbg kernel stack pointers

We already allocated critical/machine/debug check exceptions, but
we also should initialize those associated kernel stack pointers
for use by special exceptions in the PACA.

Signed-off-by: Tiejun Chen <tiejun.chen@windriver.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>

1 files changed, 12 insertions, 6 deletions

diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index f5f11a7d30e5..da9c42f53bb1 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -552,14 +552,20 @@ static void __init irqstack_early_init(void)
 static void __init exc_lvl_early_init(void)
 {
         unsigned int i;
+        unsigned long sp;
 
         for_each_possible_cpu(i) {
-                critirq_ctx[i] = (struct thread_info *)
-                        __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
-                dbgirq_ctx[i] = (struct thread_info *)
-                        __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
-                mcheckirq_ctx[i] = (struct thread_info *)
-                        __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
+                sp = memblock_alloc(THREAD_SIZE, THREAD_SIZE);
+                critirq_ctx[i] = (struct thread_info *)__va(sp);
+                paca[i].crit_kstack = __va(sp + THREAD_SIZE);
+
+                sp = memblock_alloc(THREAD_SIZE, THREAD_SIZE);
+                dbgirq_ctx[i] = (struct thread_info *)__va(sp);
+                paca[i].dbg_kstack = __va(sp + THREAD_SIZE);
+
+                sp = memblock_alloc(THREAD_SIZE, THREAD_SIZE);
+                mcheckirq_ctx[i] = (struct thread_info *)__va(sp);
+                paca[i].mc_kstack = __va(sp + THREAD_SIZE);
         }
 
         if (cpu_has_feature(CPU_FTR_DEBUG_LVL_EXC))