why are there some redundant variable definition

From: Parmenides
Date: Sun Jul 25 2010 - 17:29:11 EST

I have read a macro like this
++++ include/linux/kernel.h
159: #define min_t(type,x,y) \
160: ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; })
++++ net/ipv4/tcp_output.c
654: int full_space = min_t(int, tp->window_clamp, tcp_full_space(sk));

The definitions of __x and __y are somewhat redundant. I think a more
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