mm/percpu.c:2723:2: warning: #warning "the CRIS architecture has physical and virtual addresses confused"

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   3266b5bd97eaa72793df0b6e5a106c69ccc166c4
commit: abee210500ed15a22787009d9210b9a34911afcc percpu: hack to let the CRIS architecture to boot until they clean up
date:   3 months ago
config: cris-etrax-100lx_v2_defconfig (attached as .config)
compiler: cris-linux-gcc (GCC) 7.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout abee210500ed15a22787009d9210b9a34911afcc
        # save the attached .config to linux build tree
        make.cross ARCH=cris 

All warnings (new ones prefixed by >>):

   mm/percpu.c: In function 'setup_per_cpu_areas':
>> mm/percpu.c:2723:2: warning: #warning "the CRIS architecture has physical and virtual addresses confused" [-Wcpp]
    #warning "the CRIS architecture has physical and virtual addresses confused"
     ^~~~~~~

vim +2723 mm/percpu.c

  2688	
  2689	/*
  2690	 * UP percpu area setup.
  2691	 *
  2692	 * UP always uses km-based percpu allocator with identity mapping.
  2693	 * Static percpu variables are indistinguishable from the usual static
  2694	 * variables and don't require any special preparation.
  2695	 */
  2696	void __init setup_per_cpu_areas(void)
  2697	{
  2698		const size_t unit_size =
  2699			roundup_pow_of_two(max_t(size_t, PCPU_MIN_UNIT_SIZE,
  2700						 PERCPU_DYNAMIC_RESERVE));
  2701		struct pcpu_alloc_info *ai;
  2702		void *fc;
  2703	
  2704		ai = pcpu_alloc_alloc_info(1, 1);
  2705		fc = memblock_virt_alloc_from_nopanic(unit_size,
  2706						      PAGE_SIZE,
  2707						      __pa(MAX_DMA_ADDRESS));
  2708		if (!ai || !fc)
  2709			panic("Failed to allocate memory for percpu areas.");
  2710		/* kmemleak tracks the percpu allocations separately */
  2711		kmemleak_free(fc);
  2712	
  2713		ai->dyn_size = unit_size;
  2714		ai->unit_size = unit_size;
  2715		ai->atom_size = unit_size;
  2716		ai->alloc_size = unit_size;
  2717		ai->groups[0].nr_units = 1;
  2718		ai->groups[0].cpu_map[0] = 0;
  2719	
  2720		if (pcpu_setup_first_chunk(ai, fc) < 0)
  2721			panic("Failed to initialize percpu areas.");
  2722	#ifdef CONFIG_CRIS
> 2723	#warning "the CRIS architecture has physical and virtual addresses confused"
  2724	#else
  2725		pcpu_free_alloc_info(ai);
  2726	#endif
  2727	}
  2728	

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