powerpc/4xx: Index interrupt stacks by physical cpu

The interrupt stacks need to be indexed by the physical cpu since the
critical, debug and machine check handlers use the contents of SPRN_PIR to
index the critirq_ctx, dbgirq_ctx, and mcheckirq_ctx arrays.

Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>

2 files changed, 14 insertions, 11 deletions

diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index d3ce67cf03be..4a65386995d7 100644
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c
@@ -67,6 +67,7 @@
 #include <asm/machdep.h>
 #include <asm/udbg.h>
 #include <asm/dbell.h>
+#include <asm/smp.h>
 
 #ifdef CONFIG_PPC64
 #include <asm/paca.h>
@@ -446,22 +447,23 @@ struct thread_info *mcheckirq_ctx[NR_CPUS] __read_mostly;
 void exc_lvl_ctx_init(void)
 {
         struct thread_info *tp;
-        int i;
+        int i, hw_cpu;
 
         for_each_possible_cpu(i) {
-                memset((void *)critirq_ctx[i], 0, THREAD_SIZE);
-                tp = critirq_ctx[i];
+                hw_cpu = get_hard_smp_processor_id(i);
+                memset((void *)critirq_ctx[hw_cpu], 0, THREAD_SIZE);
+                tp = critirq_ctx[hw_cpu];
                 tp->cpu = i;
                 tp->preempt_count = 0;
 
 #ifdef CONFIG_BOOKE
-                memset((void *)dbgirq_ctx[i], 0, THREAD_SIZE);
-                tp = dbgirq_ctx[i];
+                memset((void *)dbgirq_ctx[hw_cpu], 0, THREAD_SIZE);
+                tp = dbgirq_ctx[hw_cpu];
                 tp->cpu = i;
                 tp->preempt_count = 0;
 
-                memset((void *)mcheckirq_ctx[i], 0, THREAD_SIZE);
-                tp = mcheckirq_ctx[i];
+                memset((void *)mcheckirq_ctx[hw_cpu], 0, THREAD_SIZE);
+                tp = mcheckirq_ctx[hw_cpu];
                 tp->cpu = i;
                 tp->preempt_count = HARDIRQ_OFFSET;
 #endif
diff --git a/arch/powerpc/kernel/setup_32.c b/arch/powerpc/kernel/setup_32.c
index a10ffc85ada7..93666f9cabf1 100644
--- a/arch/powerpc/kernel/setup_32.c
+++ b/arch/powerpc/kernel/setup_32.c
@@ -258,17 +258,18 @@ static void __init irqstack_early_init(void)
 #if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
 static void __init exc_lvl_early_init(void)
 {
-        unsigned int i;
+        unsigned int i, hw_cpu;
 
         /* interrupt stacks must be in lowmem, we get that for free on ppc32
          * as the memblock is limited to lowmem by MEMBLOCK_REAL_LIMIT */
         for_each_possible_cpu(i) {
-                critirq_ctx[i] = (struct thread_info *)
+                hw_cpu = get_hard_smp_processor_id(i);
+                critirq_ctx[hw_cpu] = (struct thread_info *)
                         __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
 #ifdef CONFIG_BOOKE
-                dbgirq_ctx[i] = (struct thread_info *)
+                dbgirq_ctx[hw_cpu] = (struct thread_info *)
                         __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
-                mcheckirq_ctx[i] = (struct thread_info *)
+                mcheckirq_ctx[hw_cpu] = (struct thread_info *)
                         __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
 #endif
         }