[PATCH v5] mm/sparse-vmemmap: flush_cache_vmap() after hotplugging vmemmap

[kernel test robot]

Hi Vivian,

kernel test robot noticed the following build errors:

[auto build test ERROR on dc59e4fea9d83f03bad6bddf3fa2e52491777482]

url:    https://github.com/intel-lab-lkp/linux/commits/Vivian-Wang/mm-sparse-vmemmap-flush_cache_vmap-after-hotplugging-vmemmap/20260707-121114
base:   dc59e4fea9d83f03bad6bddf3fa2e52491777482
patch link:    https://lore.kernel.org/r/20260707-mark-after-vmemmap-populate-v5-1-77d1ded3cae3%40iscas.ac.cn
patch subject: [PATCH v5] mm/sparse-vmemmap: flush_cache_vmap() after hotplugging vmemmap
config: riscv-randconfig-002-20260709 (https://download.01.org/0day-ci/archive/20260709/202607092128.yG6dYQOt-lkp@intel.com/config)
compiler: riscv64-linux-gcc (GCC) 10.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260709/202607092128.yG6dYQOt-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202607092128.yG6dYQOt-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from include/linux/cacheflush.h:5,
                    from include/linux/highmem.h:8,
                    from include/linux/bvec.h:10,
                    from include/linux/blk_types.h:10,
                    from include/linux/writeback.h:13,
                    from include/linux/memcontrol.h:23,
                    from include/linux/swap.h:9,
                    from include/linux/suspend.h:5,
                    from arch/riscv/kernel/asm-offsets.c:12:
   arch/riscv/include/asm/cacheflush.h: In function 'flush_cache_vmap':
>> arch/riscv/include/asm/cacheflush.h:60:16: error: 'VMEMMAP_START' undeclared (first use in this function)
      60 |      (start >= VMEMMAP_START && end <= VMEMMAP_END))
         |                ^~~~~~~~~~~~~
   arch/riscv/include/asm/cacheflush.h:60:16: note: each undeclared identifier is reported only once for each function it appears in
>> arch/riscv/include/asm/cacheflush.h:60:40: error: 'VMEMMAP_END' undeclared (first use in this function); did you mean 'MEMREMAP_ENC'?
      60 |      (start >= VMEMMAP_START && end <= VMEMMAP_END))
         |                                        ^~~~~~~~~~~
         |                                        MEMREMAP_ENC
   make[3]: *** [scripts/Makefile.build:184: arch/riscv/kernel/asm-offsets.s] Error 1 shuffle=275821313
   make[3]: Target 'prepare' not remade because of errors.
   make[2]: *** [Makefile:1405: prepare0] Error 2 shuffle=275821313
   make[2]: Target 'prepare' not remade because of errors.
   make[1]: *** [Makefile:248: __sub-make] Error 2 shuffle=275821313
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:248: __sub-make] Error 2 shuffle=275821313
   make: Target 'prepare' not remade because of errors.


vim +/VMEMMAP_START +60 arch/riscv/include/asm/cacheflush.h

    42	
    43	#ifdef CONFIG_64BIT
    44	/* This is accessed in assembly code. cpumask_var_t would be too complex. */
    45	extern DECLARE_BITMAP(new_valid_map_cpus, NR_CPUS);
    46	extern char _end[];
    47	static inline void mark_new_valid_map(void)
    48	{
    49		/*
    50		 * We don't care if concurrently a cpu resets this value since
    51		 * the only place this can happen is in handle_exception() where
    52		 * an sfence.vma is emitted.
    53		 */
    54		bitmap_fill(new_valid_map_cpus, NR_CPUS);
    55	}
    56	#define flush_cache_vmap flush_cache_vmap
    57	static inline void flush_cache_vmap(unsigned long start, unsigned long end)
    58	{
    59		if (is_vmalloc_or_module_addr((void *)start) ||
  > 60		    (start >= VMEMMAP_START && end <= VMEMMAP_END))
    61			mark_new_valid_map();
    62	}
    63	#define flush_cache_vmap_early(start, end)	local_flush_tlb_kernel_range(start, end)
    64	#endif
    65	

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