tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   e7b08814b16b80a0bf76eeca16317f8c2ed23b8c
commit: ca07eda33e01eafa7a26ec06974f7eacee6a89c8 [10476/14131] SUNRPC: Refactor svc_recvfrom()
config: i386-randconfig-a006-20200602 (attached as .config)
compiler: gcc-6 (Debian 6.3.0-18+deb9u1) 6.3.0 20170516
reproduce (this is a W=1 build):
        git checkout ca07eda33e01eafa7a26ec06974f7eacee6a89c8
        # save the attached .config to linux build tree
        make W=1 ARCH=i386 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp@intel.com>

All warnings (new ones prefixed by >>, old ones prefixed by <<):

>> net/sunrpc/svcsock.c:226:5: warning: "ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE" is not defined [-Wundef]
#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

vim +/ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE +226 net/sunrpc/svcsock.c

   225	
 > 226	#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
   227	static void svc_flush_bvec(const struct bio_vec *bvec, size_t size, size_t seek)
   228	{
   229		struct bvec_iter bi = {
   230			.bi_size	= size,
   231		};
   232		struct bio_vec bv;
   233	
   234		bvec_iter_advance(bvec, &bi, seek & PAGE_MASK);
   235		for_each_bvec(bv, bvec, bi, bi)
   236			flush_dcache_page(bv.bv_page);
   237	}
   238	#else
   239	static inline void svc_flush_bvec(const struct bio_vec *bvec, size_t size,
   240					  size_t seek)
   241	{
   242	}
   243	#endif
   244	

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