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Diffstat (limited to 'arch/x86/kernel/dumpstack_64.c')
-rw-r--r--arch/x86/kernel/dumpstack_64.c37
1 files changed, 5 insertions, 32 deletions
diff --git a/arch/x86/kernel/dumpstack_64.c b/arch/x86/kernel/dumpstack_64.c
index e71c98d3c0d..19853ad8afc 100644
--- a/arch/x86/kernel/dumpstack_64.c
+++ b/arch/x86/kernel/dumpstack_64.c
@@ -105,34 +105,6 @@ in_irq_stack(unsigned long *stack, unsigned long *irq_stack,
}
/*
- * We are returning from the irq stack and go to the previous one.
- * If the previous stack is also in the irq stack, then bp in the first
- * frame of the irq stack points to the previous, interrupted one.
- * Otherwise we have another level of indirection: We first save
- * the bp of the previous stack, then we switch the stack to the irq one
- * and save a new bp that links to the previous one.
- * (See save_args())
- */
-static inline unsigned long
-fixup_bp_irq_link(unsigned long bp, unsigned long *stack,
- unsigned long *irq_stack, unsigned long *irq_stack_end)
-{
-#ifdef CONFIG_FRAME_POINTER
- struct stack_frame *frame = (struct stack_frame *)bp;
- unsigned long next;
-
- if (!in_irq_stack(stack, irq_stack, irq_stack_end)) {
- if (!probe_kernel_address(&frame->next_frame, next))
- return next;
- else
- WARN_ONCE(1, "Perf: bad frame pointer = %p in "
- "callchain\n", &frame->next_frame);
- }
-#endif
- return bp;
-}
-
-/*
* x86-64 can have up to three kernel stacks:
* process stack
* interrupt stack
@@ -155,9 +127,12 @@ void dump_trace(struct task_struct *task, struct pt_regs *regs,
task = current;
if (!stack) {
- stack = &dummy;
- if (task && task != current)
+ if (regs)
+ stack = (unsigned long *)regs->sp;
+ else if (task && task != current)
stack = (unsigned long *)task->thread.sp;
+ else
+ stack = &dummy;
}
if (!bp)
@@ -205,8 +180,6 @@ void dump_trace(struct task_struct *task, struct pt_regs *regs,
* pointer (index -1 to end) in the IRQ stack:
*/
stack = (unsigned long *) (irq_stack_end[-1]);
- bp = fixup_bp_irq_link(bp, stack, irq_stack,
- irq_stack_end);
irq_stack_end = NULL;
ops->stack(data, "EOI");
continue;