[nvdimm:libnvdimm-pending 20/22] include/linux/memremap.h:123:16: error: flexible array member in union

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

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/djbw/nvdimm.git libnvdimm-pending
head:   17c5211450a8fb964757f9f51cae1dc9f973e5ee
commit: 77479ec669355699fb028eac068c6711416373f0 [20/22] mm/memremap_pages: Support multiple ranges per invocation
config: i386-tinyconfig (attached as .config)
compiler: gcc-9 (Debian 9.3.0-14) 9.3.0
reproduce (this is a W=1 build):
        git checkout 77479ec669355699fb028eac068c6711416373f0
        # 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: kernel test robot <lkp@intel.com>

Note: the nvdimm/libnvdimm-pending HEAD 17c5211450a8fb964757f9f51cae1dc9f973e5ee builds fine.
      It only hurts bisectibility.

All errors (new ones prefixed by >>):

   In file included from include/linux/mm.h:28,
                    from include/linux/kallsyms.h:12,
                    from include/linux/bpf.h:21,
                    from include/linux/bpf-cgroup.h:5,
                    from include/linux/cgroup-defs.h:22,
                    from include/linux/cgroup.h:28,
                    from include/linux/memcontrol.h:13,
                    from include/linux/swap.h:9,
                    from include/linux/suspend.h:5,
                    from arch/x86/kernel/asm-offsets.c:13:
>> include/linux/memremap.h:123:16: error: flexible array member in union
     123 |   struct range ranges[];
         |                ^~~~~~
   make[2]: *** [scripts/Makefile.build:114: arch/x86/kernel/asm-offsets.s] Error 1
   make[2]: Target '__build' not remade because of errors.
   make[1]: *** [Makefile:1175: prepare0] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:185: __sub-make] Error 2
   make: Target 'prepare' not remade because of errors.

vim +123 include/linux/memremap.h

    94	
    95	/**
    96	 * struct dev_pagemap - metadata for ZONE_DEVICE mappings
    97	 * @altmap: pre-allocated/reserved memory for vmemmap allocations
    98	 * @ref: reference count that pins the devm_memremap_pages() mapping
    99	 * @internal_ref: internal reference if @ref is not provided by the caller
   100	 * @done: completion for @internal_ref
   101	 * @type: memory type: see MEMORY_* in memory_hotplug.h
   102	 * @flags: PGMAP_* flags to specify defailed behavior
   103	 * @ops: method table
   104	 * @owner: an opaque pointer identifying the entity that manages this
   105	 *	instance.  Used by various helpers to make sure that no
   106	 *	foreign ZONE_DEVICE memory is accessed.
   107	 * @nr_range: number of ranges to be mapped
   108	 * @range: range to be mapped when nr_range == 1
   109	 * @ranges: array of ranges to be mapped when nr_range > 1
   110	 */
   111	struct dev_pagemap {
   112		struct vmem_altmap altmap;
   113		struct percpu_ref *ref;
   114		struct percpu_ref internal_ref;
   115		struct completion done;
   116		enum memory_type type;
   117		unsigned int flags;
   118		const struct dev_pagemap_ops *ops;
   119		void *owner;
   120		int nr_range;
   121		union {
   122			struct range range;
 > 123			struct range ranges[];
   124		};
   125	};
   126	

---
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