Because of x86-implement-strict-user-copy-checks-for-x86_64.patch

Because of x86-implement-strict-user-copy-checks-for-x86_64.patch

When compiling mm/mempolicy.c the following warning is shown.

In file included from arch/x86/include/asm/uaccess.h:572,
                 from include/linux/uaccess.h:5,
                 from include/linux/highmem.h:7,
                 from include/linux/pagemap.h:10,
                 from include/linux/mempolicy.h:70,
                 from mm/mempolicy.c:68:
In function `copy_from_user',
    inlined from `compat_sys_get_mempolicy' at mm/mempolicy.c:1415:
arch/x86/include/asm/uaccess_64.h:64: warning: call to `copy_from_user_overflow' declared with attribute warning: copy_from_user() buffer size is not provably correct
  LD      mm/built-in.o

Fix this by passing correct buffer size value.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>