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由 Oleg Nesterov 提交于
arch_dup_task_struct() does flush_ptrace_hw_breakpoint(src), this destroys the parent's breakpoints for no reason. We should clear child->thread.ptrace_bps[] copied by dup_task_struct() instead. Signed-off-by: NOleg Nesterov <oleg@redhat.com> Acked-by: NMichael Neuling <mikey@neuling.org> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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