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Towards adding CONFIG_UTRACE support for non-mmu m68k add arch_has_single_step, and its support functions user_enable_single_step() and user_disable_single_step(). [Geert] m68k conflict resolution from linux-next Signed-off-by: Greg Ungerer <gerg@uclinux.org> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>