[linux-next:master 10476/14131] net/sunrpc/svcsock.c:226:5: warning: 'ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE' is not defined, evaluates to 0

[linux-next:master 10476/14131] net/sunrpc/svcsock.c:226:5: warning: 'ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE' is not defined, evaluates to 0

[kbuild test robot]

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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-a013-20200601 (attached as .config)
compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 2388a096e7865c043e83ece4e26654bd3d1a20d5)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install i386 cross compiling tool for clang build
        # apt-get install binutils-i386-linux-gnu
        git checkout ca07eda33e01eafa7a26ec06974f7eacee6a89c8
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross 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 <<):

clang-11: warning: optimization flag '-falign-jumps=0' is not supported [-Wignored-optimization-argument]
clang-11: warning: optimization flag '-falign-loops=0' is not supported [-Wignored-optimization-argument]
In file included from net/sunrpc/svcsock.c:24:
In file included from include/linux/sched.h:14:
In file included from include/linux/pid.h:5:
In file included from include/linux/rculist.h:11:
In file included from include/linux/rcupdate.h:27:
In file included from include/linux/preempt.h:78:
In file included from arch/x86/include/asm/preempt.h:7:
In file included from include/linux/thread_info.h:38:
arch/x86/include/asm/thread_info.h:190:13: warning: calling '__builtin_frame_address' with a nonzero argument is unsafe [-Wframe-address]
oldframe = __builtin_frame_address(1);
^~~~~~~~~~~~~~~~~~~~~~~~~~
arch/x86/include/asm/thread_info.h:192:11: warning: calling '__builtin_frame_address' with a nonzero argument is unsafe [-Wframe-address]
frame = __builtin_frame_address(2);
^~~~~~~~~~~~~~~~~~~~~~~~~~
>> net/sunrpc/svcsock.c:226:5: warning: 'ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE' is not defined, evaluates to 0 [-Wundef]
#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
^
3 warnings generated.

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	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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