riscv: Add dump stack in show_regs
Like commit 1149aad1 ("arm64: Add dump_backtrace() in show_regs"), dump the stack in riscv show_regs as common code expects. Reviewed-by: NAtish Patra <atish.patra@wdc.com> Signed-off-by: NKefeng Wang <wangkefeng.wang@huawei.com> Signed-off-by: NPalmer Dabbelt <palmerdabbelt@google.com>
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