[PATCH v7 3/6] riscv: clarify vector state semantics on syscall and context switch

[kernel test robot]

Hi Andy,

kernel test robot noticed the following build errors:

[auto build test ERROR on d1a8d411533d6be16ac79796c02a9bfc7d7958f1]

url:    https://github.com/intel-lab-lkp/linux/commits/Andy-Chiu/riscv-vector-refactor-vector-context-operations/20261111-124323
base:   d1a8d411533d6be16ac79796c02a9bfc7d7958f1
patch link:    https://lore.kernel.org/r/20261111184359.1239821-4-tchiu%40tenstorrent.com
patch subject: [PATCH v7 3/6] riscv: clarify vector state semantics on syscall and context switch
config: riscv-allnoconfig (https://download.01.org/0day-ci/archive/20261112/202611122049.91BrkXTs-lkp@intel.com/config)
compiler: riscv64-linux-gcc (GCC) 16.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261112/202611122049.91BrkXTs-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/202611122049.91BrkXTs-lkp@intel.com/

All errors (new ones prefixed by >>):

   arch/riscv/kernel/signal.c: In function '__restore_v_state':
>> arch/riscv/kernel/signal.c:130:9: error: implicit declaration of function '__riscv_v_vstate_clean'; did you mean 'riscv_v_vstate_query'? [-Wimplicit-function-declaration]
     130 |         __riscv_v_vstate_clean(regs);
         |         ^~~~~~~~~~~~~~~~~~~~~~
         |         riscv_v_vstate_query


vim +130 arch/riscv/kernel/signal.c

   107	
   108	/*
   109	 * Restore Vector extension context from the user's signal frame. This function
   110	 * assumes a valid extension header. So magic and size checking must be done by
   111	 * the caller.
   112	 */
   113	static long __restore_v_state(struct pt_regs *regs, void __user *sc_vec)
   114	{
   115		long err;
   116		struct __sc_riscv_v_state __user *state = sc_vec;
   117		void __user *datap;
   118	
   119		/*
   120		 * Mark the vstate as clean prior performing the actual copy,
   121		 * to avoid getting the vstate incorrectly clobbered by the
   122		 * discarded vector state.
   123		 *
   124		 * This also allows user to modify vregs through the signal
   125		 * interface at a syscall stop. e.g. to support user space
   126		 * context switching.
   127		 */
   128		preempt_disable();
   129		riscv_v_vstate_set_restore(current, regs);
 > 130		__riscv_v_vstate_clean(regs);
   131		preempt_enable();
   132	
   133		/* Copy everything of __sc_riscv_v_state except datap. */
   134		err = __copy_from_user(&current->thread.vstate, &state->v_state,
   135				       offsetof(struct __riscv_v_ext_state, datap));
   136		if (unlikely(err))
   137			return err;
   138	
   139		/* Copy the pointer datap itself. */
   140		err = __get_user(datap, &state->v_state.datap);
   141		if (unlikely(err))
   142			return err;
   143		/*
   144		 * Copy the whole vector content from user space datap. Use
   145		 * copy_from_user to prevent information leak.
   146		 */
   147		return copy_from_user(current->thread.vstate.datap, datap, riscv_v_vsize);
   148	}
   149	

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