cris: arch-v10: kgdb: Add '__used' for static variable is_dyn_brkp
Within one C file, current gcc can optimize the global static variables according to the C code, but it will skip assembly code -- it will pass them to gas directly. if the static variable is used between C code and assembly code in one C file (e.g. is_dyn_brkp in kgdb.c), it needs '__used' to let gcc know it should be still used, or gcc may remove it for optimization. The related error in this case: LD init/built-in.o arch/cris/arch-v10/kernel/built-in.o: In function `kgdb_handle_breakpoint': (.text+0x2aca): undefined reference to `is_dyn_brkp' arch/cris/arch-v10/kernel/built-in.o: In function `is_static': kgdb.c:(.text+0x2ada): undefined reference to `is_dyn_brkp' Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com> Signed-off-by: Jesper Nilsson <jespern@axis.com>
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