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x86: Fix get_wchan() to support the ORC unwinder
Currently, the kernel CONFIG_UNWINDER_ORC option is enabled by default on x86, but the implementation of get_wchan() is still based on the frame pointer unwinder, so the /proc/<pid>/wchan usually returned 0 regardless of whether the task <pid> is running. Reimplement get_wchan() by calling stack_trace_save_tsk(), which is adapted to the ORC and frame pointer unwinders. Fixes: ee9f8fc ("x86/unwind: Add the ORC unwinder") Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com> Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20211008111626.271115116@infradead.org
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