[PATCH 1/2] locking: Introduce prepare_sync_core_cmd()

[kernel test robot]

Hi Andrea,

kernel test robot noticed the following build errors:

[auto build test ERROR on tip/sched/core]
[also build test ERROR on linus/master v6.6 next-20231110]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Andrea-Parri/locking-Introduce-prepare_sync_core_cmd/20231110-035816
base:   tip/sched/core
patch link:    https://lore.kernel.org/r/ZU0sliwUQJyNAH1y%40andrea
patch subject: [PATCH 1/2] locking: Introduce prepare_sync_core_cmd()
config: riscv-allnoconfig (https://download.01.org/0day-ci/archive/20231110/202311101405.3plnlyj4-lkp@intel.com/config)
compiler: riscv64-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231110/202311101405.3plnlyj4-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/202311101405.3plnlyj4-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from include/linux/sync_core.h:6,
                    from include/linux/sched/mm.h:10,
                    from include/linux/xarray.h:19,
                    from include/linux/list_lru.h:14,
                    from include/linux/fs.h:13,
                    from include/linux/huge_mm.h:8,
                    from include/linux/mm.h:1075,
                    from arch/riscv/kernel/asm-offsets.c:10:
   arch/riscv/include/asm/sync_core.h: In function 'prepare_sync_core_cmd':
>> arch/riscv/include/asm/sync_core.h:20:36: error: 'mm_context_t' has no member named 'icache_stale_mask'
      20 |         cpumask_setall(&mm->context.icache_stale_mask);
         |                                    ^
   make[3]: *** [scripts/Makefile.build:116: arch/riscv/kernel/asm-offsets.s] Error 1
   make[3]: Target 'prepare' not remade because of errors.
   make[2]: *** [Makefile:1202: prepare0] Error 2
   make[2]: Target 'prepare' not remade because of errors.
   make[1]: *** [Makefile:234: __sub-make] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:234: __sub-make] Error 2
   make: Target 'prepare' not remade because of errors.


vim +20 arch/riscv/include/asm/sync_core.h

    13	
    14	/*
    15	 * Ensure the next switch_mm() on every CPU issues a core serializing
    16	 * instruction for the given @mm.
    17	 */
    18	static inline void prepare_sync_core_cmd(struct mm_struct *mm)
    19	{
  > 20		cpumask_setall(&mm->context.icache_stale_mask);
    21	}
    22	

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