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path: root/arch/x86/kernel/dumpstack_32.c
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Diffstat (limited to 'arch/x86/kernel/dumpstack_32.c')
-rw-r--r--arch/x86/kernel/dumpstack_32.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/arch/x86/kernel/dumpstack_32.c b/arch/x86/kernel/dumpstack_32.c
index 64a59d726639..8e3a8fedfa4d 100644
--- a/arch/x86/kernel/dumpstack_32.c
+++ b/arch/x86/kernel/dumpstack_32.c
@@ -29,6 +29,9 @@ const char *stack_type_name(enum stack_type type)
if (type == STACK_TYPE_ENTRY)
return "ENTRY_TRAMPOLINE";
+ if (type == STACK_TYPE_EXCEPTION)
+ return "#DF";
+
return NULL;
}
@@ -82,6 +85,30 @@ static bool in_softirq_stack(unsigned long *stack, struct stack_info *info)
return true;
}
+static bool in_doublefault_stack(unsigned long *stack, struct stack_info *info)
+{
+#ifdef CONFIG_DOUBLEFAULT
+ struct cpu_entry_area *cea = get_cpu_entry_area(raw_smp_processor_id());
+ struct doublefault_stack *ss = &cea->doublefault_stack;
+
+ void *begin = ss->stack;
+ void *end = begin + sizeof(ss->stack);
+
+ if ((void *)stack < begin || (void *)stack >= end)
+ return false;
+
+ info->type = STACK_TYPE_EXCEPTION;
+ info->begin = begin;
+ info->end = end;
+ info->next_sp = (unsigned long *)this_cpu_read(cpu_tss_rw.x86_tss.sp);
+
+ return true;
+#else
+ return false;
+#endif
+}
+
+
int get_stack_info(unsigned long *stack, struct task_struct *task,
struct stack_info *info, unsigned long *visit_mask)
{
@@ -105,6 +132,9 @@ int get_stack_info(unsigned long *stack, struct task_struct *task,
if (in_softirq_stack(stack, info))
goto recursion_check;
+ if (in_doublefault_stack(stack, info))
+ goto recursion_check;
+
goto unknown;
recursion_check: