min() and max() have warning: comparison of distinct pointer types lacks a cast

[LF.Tan]

Hi all

Have these warning messages when compiling kernel.
Anyone know what's wrong?

Regards.
----------------------------
In file included from mm/readahead.c:10:0:
mm/readahead.c: In function 'max_sane_readahead':
include/linux/kernel.h:713:17: warning: comparison of distinct pointer
types lacks a cast [enabled by default]
  (void) (&_min1 == &_min2);  \
                 ^
mm/readahead.c:242:9: note: in expansion of macro 'min'
  return min(nr, MAX_READAHEAD);
         ^

-------------------------------------------------------------------------------
mm/rmap.c:1279:22: note: in expansion of macro 'min'
 #define CLUSTER_SIZE min(32*PAGE_SIZE, PMD_SIZE)
                      ^
mm/rmap.c:1280:25: note: in expansion of macro 'CLUSTER_SIZE'
 #define CLUSTER_MASK (~(CLUSTER_SIZE - 1))
                         ^
mm/rmap.c:1298:39: note: in expansion of macro 'CLUSTER_MASK'
  address = (vma->vm_start + cursor) & CLUSTER_MASK;
                                       ^
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