编译内核一直出现 warning: passing argument 2 of '__memcpy' discards

[jkll]

编译内核一直出现这个问题 救我

.h: In function 'memcpy_fromio':
include/asm/io_32.h:151: warning: passing argument 2 of '__memcpy' discards qualifiers from pointer target type
include/asm/io_32.h: In function 'memcpy_toio':
include/asm/io_32.h:157: warning: passing argument 1 of '__memcpy' discards qualifiers from pointer target type