Linux内核模块中的x87内联程序集的操作数类型不匹配

I really want to use floating point arithmetic in a Linux kernel module, just for the heck of it. I don't want to do anything fancy, just use the x87 trig instructions and/or the sqrt instruction, then assign the result to a variable. That's about it. So far, I've tried:I really want to use floating point arithmetic