[mmotm:master 153/210] lib/list_sort.c:17:36: warning: 'pure' attribute ignored

[kbuild test robot <lkp@intel.com>]

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tree:   git://git.cmpxchg.org/linux-mmotm.git master
head:   ecb428ddd7449905d371074f509d08475eef43f0
commit: 14ce92c1cbed4da6460b285f83e2348cf2416e45 [153/210] lib/list_sort: simplify and remove MAX_LIST_LENGTH_BITS
config: riscv-tinyconfig (attached as .config)
compiler: riscv64-linux-gcc (GCC) 8.1.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout 14ce92c1cbed4da6460b285f83e2348cf2416e45
        # save the attached .config to linux build tree
        GCC_VERSION=8.1.0 make.cross ARCH=riscv 

All warnings (new ones prefixed by >>):

>> lib/list_sort.c:17:36: warning: 'pure' attribute ignored [-Wattributes]
      struct list_head const *, struct list_head const *);
                                       ^~~~~~~~~

vim +/pure +17 lib/list_sort.c

     9	
    10	/*
    11	 * By declaring the compare function with the __pure attribute, we give
    12	 * the compiler more opportunity to optimize.  Ideally, we'd use this in
    13	 * the prototype of list_sort(), but that would involve a lot of churn
    14	 * at all call sites, so just cast the function pointer passed in.
    15	 */
    16	typedef int __pure __attribute__((nonnull(2,3))) (*cmp_func)(void *,
  > 17			struct list_head const *, struct list_head const *);
    18	

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