为什么链接的时候会报重复问题？

[karldonitz]

链接的时候报了大量重复问题， 部分如下：
board/rt2880/librt2880.a(serial.o)：在函数‘__test_and_set_bit’中：
/home/karldonitz/router-project/uboot-mt7620/include/asm/bitops.h:456: __test_and_set_bit'被多次定义 lib_mips/libmips.a(board.o):/home/karldonitz/router-project/uboot-mt7620/include/asm/bitops.h:456：第一次在此定义 board/rt2880/librt2880.a(serial.o)：在函数‘test_and_clear_bit’中： /home/karldonitz/router-project/uboot-mt7620/include/asm/bitops.h:478: test_and_clear_bit'被多次定义
lib_mips/libmips.a(board.o):/home/karldonitz/router-project/uboot-mt7620/include/asm/bitops.h:478：第一次在此定义
board/rt2880/librt2880.a(serial.o)：在函数‘__test_and_clear_bit’中：
/home/karldonitz/router-project/uboot-mt7620/include/asm/bitops.h:502: __test_and_clear_bit'被多次定义 lib_mips/libmips.a(board.o):/home/karldonitz/router-project/uboot-mt7620/include/asm/bitops.h:502：第一次在此定义 board/rt2880/librt2880.a(serial.o)：在函数‘test_and_change_bit’中： /home/karldonitz/router-project/uboot-mt7620/include/asm/bitops.h:524: test_and_change_bit'被多次定义
lib_mips/libmips.a(board.o):/home/karldonitz/router-project/uboot-mt7620/include/asm/bitops.h:524：第一次在此定义
board/rt2880/librt2880.a(serial.o)：在函数‘__test_and_change_bit’中：
/home/karldonitz/router-project/uboot-mt7620/include/asm/bitops.h:548: __test_and_change_bit'被多次定义 lib_mips/libmips.a(board.o):/home/karldonitz/router-project/uboot-mt7620/include/asm/bitops.h:548：第一次在此定义 board/rt2880/librt2880.a(serial.o)：在函数‘test_bit’中： /home/karldonitz/router-project/uboot-mt7620/include/asm/bitops.h:570: test_bit'被多次定义
lib_mips/libmips.a(board.o):/home/karldonitz/router-project/uboot-mt7620/include/asm/bitops.h:570：第一次在此定义
board/rt2880/librt2880.a(serial.o)：在函数‘find_first_zero_bit’中：
/home/karldonitz/router-project/uboot-mt7620/include/asm/bitops.h:590: find_first_zero_bit'被多次定义 lib_mips/libmips.a(board.o):/home/karldonitz/router-project/uboot-mt7620/include/asm/bitops.h:590：第一次在此定义 board/rt2880/librt2880.a(serial.o)：在函数‘find_next_zero_bit’中： /home/karldonitz/router-project/uboot-mt7620/include/asm/bitops.h:637: find_next_zero_bit'被多次定义
lib_mips/libmips.a(board.o):/home/karldonitz/router-project/uboot-mt7620/include/asm/bitops.h:637：第一次在此定义

求作者帮助~