MIPS: Fix Magic SysRq L kernel crash.
show_backtrace() was passed a NULL pointer which caused paging request fail. Set to current task as other architectures (ARM, etc) do when passed a NULL task pointer. Signed-off-by: NVincent Wen <vincentwenlinux@gmail.com> Cc: linux-mips@linux-mips.org Cc: cernekee@gmail.com Patchwork: https://patchwork.linux-mips.org/patch/3524/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
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