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Revert "arm64: fix infinite stacktrace" 

This reverts commit 7e7df71fd5.

When unwinding out of the IRQ stack and onto the interrupted EL1 stack,
we cannot rely on the frame pointer being strictly increasing, as this
could terminate the backtrace early depending on how the stacks have
been allocated.

Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Will Deacon 2018-07-12 11:37:40 +01:00
parent db7a2d1809
commit e87a4a92fb
1 changed files with 0 additions and 3 deletions
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3
arch/arm64/kernel/stacktrace.c
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@ -56,9 +56,6 @@ int notrace unwind_frame(struct task_struct *tsk, struct stackframe *frame)
frame->fp = READ_ONCE_NOCHECK(*(unsigned long *)(fp));
frame->pc = READ_ONCE_NOCHECK(*(unsigned long *)(fp + 8));
if (frame->fp <= fp)
return -EINVAL;
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
if (tsk->ret_stack &&
(frame->pc == (unsigned long)return_to_handler)) {